Egg Lab

Egg Lab
Elise Velau
10/13/14
Period 4
Eggspearament
Goal or Problem Investigated: I want to see what happens to an egg if it is soaked in vinegar for a
couple of days. I hope that the raw egg does not make a mess if the shell dissolves. I hope that I will
be able to experiment with a raw egg, and a hard boiled egg.
Hypothesis: If I put the egg in vinegar, then the egg shell will dissolve in the vinegar, because of the
acid in the vinegar will prove to be stronger than the egg shell.
Materials: Raw egg, hard boiled egg, 2 jars with lids, and vinegar ( enough to cover the eggs when
they are each placed in a separate jar)
Variables: Note the three types of variables in your experiment. Manipulated Variable – the egg
being raw or hard boiled Responding ... Show more content on Helpwriting.net ...
A physical property, is a characteristic of a substance that can be observed without changing the
substance into another substance. A chemical change, is a change in matter that produces one or
more new substances. A closed system, is a system in which no matter is allowed to enter or leave.
When I started, both of the eggs had a hard white shell on the outside. When I started, both of the
jars of vinegar also had clear vinegar in them, not dingy vinegar. Before anything happened to the
eggs, both of their shells were white, and you could not see through them. When I put in my egg
with vinegar, the bubbles in the vinegar instantly started forming around the egg.
Over the course of one day, the top of my closed chamber started to become foggy. The vinegar in
my closed chamber, also started to become dingy, and there was some egg she'll remains mixed with
bubbles around the vinegar.
I know that a chemical reaction took place, because the egg shell started to dissolve from the acid
and the bubbles in the vinegar. I also know that a chemical reaction took place, because part of the
egg shell started to form into a different
... Get more on HelpWriting.net ...

Solute Concentration of Potatoes Essay
Nov 19/12 Solute Concentration of Potatoes Block 2–2
Purpose: To determine the concentration of solute in the potato's cytoplasm by measuring the change
in mass after the process of osmosis.
Materials and Equipment: Refer to Biology 12 Lab Manual – Investigation 13
Procedure: Refer to Biology 12 Lab Manual – Investigation 13
Data and Observations:
The Potatoes change in mass after the process of Osmosis Test Tube # | Concentration of Sucrose
Solution (mol/L) | Initial mass (g) | Final mass (g) | Change in mass (g) | Percentage change in mass
(%) | 1 | 1.0 | 5.12 | 3.63 | –1.49 | 29.0% | 2 | ... Show more content on Helpwriting.net ...
As the Concentration of the Sucrose Solution decreases, the more the potato's mass increases. This
is due to the solution being hypertonic. So, as the solute concentration gets lower, the potato's water
concentration will get higher, therefore more water particles from the solution will absorbed by the
potato. Some changed very little in mass because the concentrations of the H2O molecules in the
potato and outside the potato were equal. This equality in concentration is called Isotonic.
2) When the concentration was at 0.3M, the potato's cytoplasm and the sucrose solution was
isotonic. The concentration of the potato's cytoplasm was having the same solute concentration as
the surroundings. Therefore, there would be no net movement of materials happening. 3) The mass
of the potato cells would decrease, since the NaCl is a higher concentration than theH20 molecules
inside the potato cells. So, the potato's cells will evacuate and go into the surroundings, making it
shrivel. This is known as a hypotonic solution. 4) The Sucrose molecules cannot pass through the
plasma membrane, but osmosis can still occur. So, the permeability of the potato's cytoplasm only
applies to the H2O molecules. 5) Salt can use as a weed killer because the salt itself can cause the
plant to dehydrate through osmosis. Since the salt has a higher concentration, it will cause the plants
water molecules and nutrients to be absorbed by the salt, leaving the plant all

Potato Osmosis Lab Report
Introduction
Most Organisms on earth have a process of water movement in their cell; in other words, they go
through a process called osmosis. Osmosis is a form of diffusion in which water diffuses through a
selectively permeable membrane from hypotonic concentration into hypertonic, or low to high
concentration. For that reason, we set out to investigate a scientific question, which was to
determent what the concentration of salt will be in potato. We used the information we gathered in
class to find out if the different levels of salt concentration will affect water movement in the potato.
In today's lab, the main goal of the experiment will be to examine and observe the concentration of
salt. The evidence gathered in this class stated that ... Show more content on Helpwriting.net ...
Additionally, we examined how the potato reacts when we have a different concentration solution.
Depend on this experiment our data determines that, if the amount of salt solution increases the
osmosis movement in the potato will decrease, or the potatoes will loss weight which the result
supports our hypothesis, but if the amount of the salt solution decreases the osmosis in the potato
piece will increase or the potato will gain water. Our data and report showed that the hypothesis was
right, and the result is as we expected, but if we added some independent variable for example if we
change the salt solution to different solution we should see more result than we saw in this
experiment. The result we get on this experiment supports our hypothesis because we find the
reliable result as we learned in this class. However there are several factors that can cause our result,
one of the factors that can cause our result could be when we measure our potato before and after
can cause the result. Another factor that affect our result cloud be the salt solution concentration
measurement may not be accurate that can affect our result as well as the first reason. For future
improvement, we need to make sure that the size and the weight of the potatoes are equal, and the
solution is accurate, and measuring the potato correctly before and after we soaked in the solution. If
I

Egg Osmosis Lab Report
The hypothesis was not supported because the higher the concentration of NaCl solution, the lower
the rate of osmosis as the water ions are attracted to the NaCl ions against the concentration
gradient. As shown in table 1.0 the mass of the egg changes each time it is placed in a certain
concentrated solution. The reason for this change in mass is the process of osmosis through the egg's
semi–permeable membrane. The water within the egg cell's vacuole can expand or shrink depending
on the amount of water within it, contributing to the egg mass. Water ions are attracted to Sodium
Chloride ions, therefore the higher external concentration of NaCl the less water that will be inside
the egg's vacuoles. If the egg is placed in a high NaCl concentration, for example the 10% solution
then it will ... Show more content on Helpwriting.net ...
Another measure to the accuracy of the results is the R2, the values being 0.963 and 0.964 which are
very close to 1 therefore meaning the points are very close to the line of best fit. The validity is not
very high as throughout both attempts of the practical, one being from 10% to 0% and 0% to 10%
the results slightly varied when they should be almost identical in rate of osmosis, for example
during the 0% to 10% attempt when the egg was submerged in 5% concentration it had a positive
rate of osmosis therefore the egg still gained mass whereas for the 10% to 0% attempt when the egg
was placed in the 5% concentration the egg had a positive rate of osmosis therefore gaining weight
making the results not very valid as this should not have occurred but could have because of a
outlier or

Osmosis Lab Report
The purpose of this investigation lab is to observe osmosis of water into a cell, and also how. The
goal of the experiment is to prove that a solution in an area of high concentration will move to an
area of low concentration. In this experiment, we used sheep blood, 0.9% NaCl, 10% NaCl, and
dH2O water to see what will cause when we add this to the cell. We will then record the rate of
diffusion by measuring how did the blood flow into each solution and recording them. First, we
placed with the wooden applicator stick, then dip the end into the blood and place tiny drop in the
slide to observe what it will do. In the first one we place 1 drop of 0.9% of NaCl with the drop of
sheep blood and absorb excess liquid, after that we observe the cells under the microscope with the
40x then 100x and then the high power of 400x, to see what it will look like in each lens. The
second one we put 1 drop of 10% NaCl solution into the slide with the drop of blood and use filter
paper to absorb excess liquid. After that we observe cells under the microscope with the 40x then
100x and then the high power of 400x, to see what this will do differently than the first one.

Egg Osmosis Using ' Deshelled ' Chicken Eggs
Egg Osmosis Using "Deshelled" Chicken Eggs
Martekka Crawford
India Williams
Desiree Counts
Mark Beckford
Biology 1611–Sec 348
Dr. M. Jones
September 17, 2015
Georgia Perimeter College– Decatur
Introduction
The osmolarity of a solution is the concentration measured of a solute. To determine the
concentration of a solution, one must first understand what osmosis is and how it works. Osmosis is
the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane
according to the Britannica Encyclopedia. The semipermeable membrane is one that blocks the
passages of dissolved substances such as solutes. This process, in more recent times, provides a
more accurate study of how water can diffuse across a cell membrane when water molecules have a
high concentration to an area in which they have a low concentration. It was originally studied in
1877 by plant physiologist, Wilhelm, Pfeffer. (Britannica Encyclopedia 2015).
Osmosis is described in one of three ways when comparing more than one solution. The cell's
external and internal environment helps determine tonicity, which is defined as how the cell reacts to
its environment. When the cell's environment is equal in osmolarity to itself and there is no change,
it is considered an isotonic solution. When the environment has a higher osmolarity, shrinkage
occurs and it is considered a hypertonic solution. When the environment has a lower osmolarity,
swellings occurs and it is considered hypotonic.

Osmosis Lab Report Essay
Osmosis Rates in Artificial Cells
Daniel George
Department of Biology
Grand Valley State University
1 Campus Drive
Allendale, MI 49401 georged@mail.gvsu.edu Abstract The lab for this paper was conducted for the
topic of osmosis, the movement of water from high to low concentration. Five artificial cells were
created, each being filled with different concentrated solutions of sucrose. These artificial cells were
placed in hypertonic, hypotonic, or isotonic solutions for a period of 90 min. Over time, the rate of
osmosis was measured by calculating the weight of each artificial cell on given intervals (every 10
minutes). The resulting weights were recorded and the data was graphed. We then could draw
conclusions on the lab. ... Show more content on Helpwriting.net ...
The dialysis tubing will be clamped at one end in order to fill it and then clamped at the other end to
seal the filled bag. If the bag is not soft and floppy, the experiment will not work. Blot a bag with a
paper towel to absorb the moisture and weigh it, if this blotting process is not done it could interfere
with the weight readings creating inaccurate information. After the bags of the solutions are
prepared, they will be placed into five different beakers with different solutions. Beakers 1–4 will be
filled with tap water and the fifth beaker is filled with 40% sucrose and water. Fill each beaker with
just enough water or solution so that the bag is covered and place the bags in the beakers
simultaneously and record each time. Every 10 min the bags are to be taken out, blotted, and
weighed again before returning them back into their respective beaker for another 10 min. The
process is repeated until you have reached 90 min. The weights should be recorded in grams (g).
Results
Table 1 shows the contents of the bags and the content of the concentration it was submersed in.
Bags 2–4 each contain a solution of both sucrose and water. These bags were each put into beakers
containing hypertonic solution. These bags gained weight over time because the water moved from
its high concentration inside the beaker to the low concentration inside the membrane of the
artificial cell, the membrane being the bags that consisted of dialysis tubing. The

Osmosis Egg Lab Report
During the course of this lab, an egg is placed in different solutions to observe its reactions to each
individual solution. The egg is first weight when it is at its original state in order to differentiate a
change in its mass. Then it is placed in each solution for about 24 hours in order to see a visible and
evident reaction. The reaction involves a passive transport known as osmosis. Osmosis is the
transfer of water across a selectively permeable membrane in order to find a dynamic equilibrium,
which means both sides are completely balanced. However, only water is allowed to navigate inside
and outside of the cell during osmosis. Water moves from a higher concentration to a lower
concentration, which means that depending on the egg's water supply compared to each substance,
its mass should change. This was observed in 3 different solutions, which include vinegar, corn ...
Show more content on Helpwriting.net ...
Before the 24 hours passed, it weight 56.22 grams and was composed of a hard white shell.
Afterwards, its white hard shell disintegrated in the solution, leaving the egg a cloudy yellow color
and a firm exterior. It became delicate, yet it looked strong enough to hold itself together. It also had
a soft exterior that seemed fragile to the touch. After observing it visually, the egg was placed in a
weighing dish and weight. The egg ended up weighing 71.91 grams after being placed in vinegar,
showing an increase of 15.69 grams . Due to the process of osmosis, we can imply that the vinegar
was hypertonic, meaning there was a higher concentration of water, while the egg was hypotonic,
meaning there was a lower concentration of water. This would imply that the water concentration
was unbalanced, which will cause the water to be transported to the inside of the egg to find a
dynamic equilibrium. Since water moves from a higher concentration to a lower concentration, it
would make sense that the water would transfer to the inside of the

The Effect Of Temperature And Solution Concentration On...
Osmosis is the diffusion of water entering and leaving cells to keep a balance of concentration and
water between the cell and environment. The process of osmosis constantly occurring in a cell and is
critical for the cells in animals and plants for survival. Factors that influence the rate of osmosis are
temperature, molecular size, pressure, and concentration gradient. These variables can increase or
decrease the rate which osmosis occurs. If a cell takes in too much water through osmosis, it can
swell, rupture, and dye. If a cell does not have enough water, or too much water leaves the cell, then
the cell will shrivel. We performed an experiment that explored the process of osmosis and how
temperature and solution concentration effects the rate at which it occurs. We created artificial cells
and varied their solution concentration and the temperature of the water the cells were emerged in.
Our data was collected by the mean corrected cumulative weights calculated which showed that
both temperature and solution concentration have an effect on the rate of osmosis.
Title
Diffusion is the solute's passive movement across a membrane from an area of high concentration to
an area of low concentration. This occurs in response to the thermal energy in molecules that causes
them to constantly be moving. Water can also diffuse passively across a membrane from high water
concentration to an area of low water concentration, a process known as osmosis. Osmosis will
continue to

Osmosis lab/ concentrations of solutions effect on...
"Do different concentrations of solutions determine the mass of a potato?"
Introduction:
The way to get the full results of this lab was through the process of osmosis. Osmosis is the
movement of water across a membrane into a more concentrated solution to reach an equilibrium.
When regarding cells osmosis has three different terms that are used to describe their concentration.
The first of these words is isotonic. Cells in an isotonic solution show that the water has no net
movement and the amount of water that goes in is the same that goes out. Isotonic comes from the
root iso, which means equal. This makes sense because the definition of isotonic is: same
concentration. The second out of three words is hypotonic. Cells in a hypotonic ... Show more
content on Helpwriting.net ...
The dependent variable in the experiment was the percent change in mass and the independent
variable was the solution. This is a quantitative experiment because it was measuring the percent
change in the mass of the potatoes.
Results:
Data:
The chart below shows the % change in mass after being in their concentrated solutions:
Next Page (didn't fit)
Concentration (M)0m.2m.4m.6m.8m1m
Initial Mass(g)3.6g3.8g3.9g3.1g3.0g3.0g
Final Mass (g)4.1g3.9g3.4g2.2g2.0g1.9g
% Change in Mass14.9%1.8%–12.1%–28.6%–33.3%–36.9%
Analysis:
The Graphs below show the percent changes in mass for both the class averages and our group's

averages:
Conclusion:
In conclusion when the molarity level was at 0 and at .2 the potatoes had gained mass so therefore
they were placed in a hypotonic environments. When the molarity level was .4 and above the
potatoes loss mass so therefore they were placed in hypertonic environments. So the different in
concentrations does change the mass of the potatoes because they determine the osmosis
environments.
Discussion:
The hypothesis for this experiment was that at 0m and at .2m the potato core was going to swell
making the surroundings it was in hypotonic. For .4m it was stated that the potato core would stay
the same, making the surroundings it was in isotonic. For that last three solutions, .6m, .8m, and 1m,
it was thought that they would shrink, so that would mean that that the environment that they were
placed in was hypertonic. Although these

Egg Osmosis Hypothesis
Statement of the Problem What will happen to the egg when a student tests osmosis with 3 different
soultions in a cup.The student is trying to see or find the effects of osmosis on an egg.Osmosis is the
movement of water molecules through a selecfively permeable membrane. Diffuision is when
something spreads more widely and equilibrium means when somethings is at rest due to equal
opposite forces. The student wants to find out if the egg will shrink, fill up, or change in any way.
Hypothesis How will the cell change as a result of being placed in different types of liquids? In this
experiment we studied and tested the effects corn syrup, vinegar, and distilled water had an egg.
When placed in vinegar the egg will double in size because the egg will soak up the vinegar. When
placed in corn syrup the egg will shrink in size because the corn syrup will cause the egg to throw
everything out. ... Show more content on Helpwriting.net ...
in grams before anything and write down the new information Retrieve the solo cup with the egg in
it and fill with the amount of vinegar that covers the egg appropriattly With the styrofome cup fill it
with enough water to put inside the solo cup weighing down the egg Wait 24 hrs Day 2) Have the
student check on the egg and rinse off gently as well as the solo cup Observe the egg and write
down some observations Weigh the egg in grams Fill the solo cup with corn syrup until it
completely consumes the egg Again put the water into the styrofome cup to weigh down the egg
carefully Wait 24 hours Day 3) Rinse off the egg and cup again and descrive the new changes in
your obsevations Weigh only the egg carfully in grams This time, fill the solo cup with the egg in it
with distilled water Grab your styrophome cup and fill it appotrpiratly with water until the egg is
weighed down Wait 24

Tonicity Lab Report
The purpose of this experiment is to investigate and observe diffusion through living membrane in a
sheep blood and how the tonicity can make a huge effect in solutions. The purpose of this
experiment is to investigate and observe diffusion through living membrane in a sheep blood and
how the tonicity can make a huge effect in solutions.
Introduction:
Every cell is selectively permeable to different molecules. Diffusion is the tendency of molecules to
move from an area where they are in higher concentration to an area where they are in lower
concentration. The diffusionof water across a semipermeable membrane is called osmosis. Osmosis
occurs when the concentration of a solvent is different on opposite sides of a membrane. Tonicity is
how ... Show more content on Helpwriting.net ...
Consequently, the cells neither gain nor lose water by osmosis. With 10% of sodium chlorine and
sheep's blood, cells lose water by osmosis and shrink or crenate. This is referred to hypertonic
solution because more solute is presented inside the cells than water. However, when we observed
only distilled water and sheep's blood, the outcome was in hypotonic solution. This is because more
water is presented inside the cells than solute. Moreover, cells take on water by osmosis until they
become bloated and

Lab Report On Dicytatis In Osmosis
Introduction The purpose of this lab is to determine how the egg changes when it was in different
substances which were distilled water and corn syrup. The reason the eggs change in size is because
of osmosis. Osmosis is a form of facilitated diffusion when water moves through channels, water is
moving from high to low. There are three types of solutions, isotonic, hypertonic and hypotonic.
When the egg is placed in an isotonic solution the egg will stay the same size. Isotonic is when the
concentration of water is the same outside and inside the cell and water moves equally in both
directions. When an egg is placed in hypertonic solution the egg will grow because hypertonic is
when the concentration of water is higher outside the cell than inside. When an egg is placed in a
hypertonic solution the egg will shrink because hypertonic is when the concentration of water is
higher outside the cell than inside the cell.
Osmosis can happen when salt is put on a slug. The salt will take all moisture out of the slug,
because there is more water inside the cell than out. Therefore the slug will lose more fluid than it
can tolerate so it will become dehydrated and die ("Why Slugs Hate Salt").The hypothesis for corn
syrup is if the egg is placed in corn syrup than the egg will become smaller because the corn syrup is
thick so it has little water which causes it to shrink. The hypothesis for distilled water is if the egg is
placed in distilled water then it will get bigger because the water will cause the egg to expand.
Materials
Deshell 2 eggs
Distilled water
Corn Syrup
2 Cups
Scale
Procedure
Get two de shelled eggs.
Place each egg on the scale.
Take the mass of each individual egg.

Record the data.
Fill up cup about halfway with distilled water and label.
Fill up another cup about halfway with corn syrup and label.
Place each egg in a cup.
Let sit for 2–3 days.
Take the eggs out of the cup.
Weigh the eggs.
Record the data.
Calculate the change in mass.
Date and Results
Table 1. Change in mass of eggs in different solutions
Type of Solution
Before (g)
After (g)
Change to Mass (g)
Corn Syrup
91.09
43.92
–47.17
Distilled Water
80.91
83.9
2.99
Figure 1. Change in mass of eggs in different solutions

Potato Osmosis Lab Report
Chloé ten Brink
Biology Block C
Dr Reza
22/11/2017
Bio Lab Report
An Experimental Study on the Estimation of the Osmolarity of Potato Cores
Research Question:
How do different concentrations of sucrose solutions (0M, 0.2M, 0.4M, 0.6M, 0.8M, 1M) affect the
mass of potato cores when in sucrose solution?
Background information:
Osmosis is the diffusion of water across a membrane to create an equilibrium between the levels of
concentration of a solute both inside and outside the cell. In this case the solute will be sugar as the
potato core will be immersed in sucrose solution.
There are 3 potential states that the cell could be in depending on the type of solution:
Either the solution is hypotonic which means that the solution has a lower concentration than the
potato core and this would cause water to flow into the potato and make it larger and therefore
increase its mass. The state the cell is in is called turgid.
It could also be an isotonic solution. This is when the concentration (or molarity) of the cell is
identical with the concentration of the solution. In this case the cell (or potato core) stays the same
in size, which is called flaccid. No water moves either in or out of the cell.
Finally, it could also be a hypertonic solution which is when there is a higher concentration of solute
in the solution than in the cell and therefore the water leaves the cell. This make the cell
plasmolyzed or "shrunken". In our experiment this means that the potato cell would

Microbiology Essay
Osmosis
4/13/13
MLT1 Lab 9
Performed at Home
Microbial Growth
There are three types of environments in which cells are located which include isotonic, hypotonic
and hypertonic. In an isotonic environment, the amount of water and solute are the same both inside
and outside of the cell. As water drifts into the a cell, the same amount flows out creating a balanced
environment both inside and outside of the cell. When there is a high level of water on the outside of
the cell and a high amount of solute inside the cell, water will be drawn inside of the cell creating a
hypotonic solution. The increase in water inside the cell causes the cell to become engorged and
erupt. In a ... Show more content on Helpwriting.net ...
The water activity also plays a big role in the microbes ability to survive as most cannot grow in a
water activity level less than 0.91. Based on observations and construction of a data table, it was
shown that the 1% NaCl solution had a water activity level of 0.99, the 7% NaCl solution 0.96 and
the 15% NaCl solution 0.91. Based on the table it was expected that there would be no growth in the
15% NaCl solution as most microbes cannot survive at a water activity level of 0.91. In the S.
cerevisiae specimen, moderate growth was expected and observed based on the knowledge that most
microbes desire this type of environment for growth. The same was expected although a larger
amount of growth was observed for the S. epidermidis specimens in the 1% NaCl solution than
expected. The 1% NaCl solution provided the best environment for the growth of both microbes.
Minimal growth of S. cerevisiae and moderate growth of S. epidermidis was observed from the 7%
NaCl solutions. The S. epidermidis is used to a slightly salty environment on the surface of skin
which may account for the higher growth over S. cerevisiae in this environment. Lastly, no growth
was noted in either specimen of 15% NaCl. This type of environment does not support the growth of
most microbes due to the increase in salt content and the hypertonic environment it creates.
Sucrose Solution/Results Sucrose was not included in

Lab Report On Osmosis Experiment Essay
Lab Report 4 Osmosis in Potatoes
Introduction
In this lab we are going to discovery how osmosis works using a semi–impermeable membrane a
potato slice. Osmosis is known as the movement of water in and out of a cell. To understand how
this works we must understand two terms. Hypotonic means the environment has less solutes
compared to the inside of the cell. Hypertonic means that the environment has more solutes
compared to the inside of the cell. With osmosis water will always move from hypotonic too
hypertonic. So the question is will water move into the potato or out of the potato? Will these results
change when placed in different morality of salt water? To calculate these results, we will measure
the mass of potatoes cut into equal sizes then soak these potato slices in different morality of NaCl
for thirty minutes and measure the mass change in each potato slice.
Materials
Potato (four slices)
Knife
Beaker (4)
Salt Solution .2, .4, .6 mol
Distilled water
Food Scale
Paper Towels
Methods
First I gather all my materials needed for the experiment (see materials list). Second I peel and slice
potatoes weigh each potato in grams. Get these slices to weigh the same in mass because if they
vary to much in mass that could affect the results of the experiment. Third I place each potato in its
own beaker. Fourth once the potatoes are placed in beakers I make sure to place enough solution to
fully cover the potato. Each beaker should have a different amount of

Osmosis Egg Lab Report
Sharifah Leben
Anatomy & Physiology 1
Dr. Pasley
17 February 2016
Osmosis Egg Lab
Central Question
The purpose of this lab is to determine what is the concentration of the unknown solution along with
what concentration would be more isotonic to the chicken egg?
Hypothesis
If we placed our chicken egg into a higher percentage of sucrose solution for a set period of 60
minutes then the egg will gain weight. If the egg gained weight then the sucrose solution it was
placed in had a low concentration that would make it hypotonic. If the egg loses weight then sucrose
solution it was placed in had a high concentration that made it hypertonic. If there is no change in
weight in the chicken egg when placed in the concentration the solution will happen to be isotonic.
Method ... Show more content on Helpwriting.net ...
The solutions are 0% sucrose, 10% sucrose, 20% sucrose, 30% sucrose, 40% sucrose and an
unknown sucrose concentration. We then weighed each egg separately to the nearest gram in order
to have an initial starting weight to compare to the results throughout our experiment being
conducted. The eggs were then placed in each beaker for 12 intervals at a time. After every 12
minutes the eggs were taken out and weighed to see if the weight of the egg changed. With a total of
five intervals (12, 24, 36, 48, 60) the steps were repeated till the egg had reached the total time of 60
minutes. The changes in weight of the eggs were then added into a data table showing the weight of
the chicken eggs in grams vs. the time in minutes. In a second data table the weight changes (g) vs.
time (min.) between the eggs were taken and used the difference from each time and subtracted it
from the initial

Lab Report Osmosis Essay
The effect of osmosis on artificial cells with different concentrations of sucrose
Alex McRae
Biology 120–902 Grand Valley State University 1 Campus Drive Allendale, MI 49401
mcraeal@mail.gvsu.edu
Abstract In this study, we tested the validity of osmosis in artificial animal cells. Osmosis is the
diffusion of free water across a membrane. The purpose of the study was to calculate the rate of
osmosis in artificial cells containing different concentrations of sucrose and water. We studied the
rate of osmosis in artificial cells by creating five different dialysis bags with different concentrations
of both sucrose and water and calculating the cumulative change in weight ever 10 ... Show more
The bags were put in their corresponding beakers, all of which contained tap water, except beaker #5
(tap water bag #5 was placed in beaker #5 which instead of holding water, was filled with 40%
sucrose) concurrently, recording the time. In the same manner in which the bags were placed in the
beakers simultaneously, remove the bags every 10 minutes, and record the weight of each bag. This
process should be repeated for at least 90 minutes total. This data was analyzed by calculating the
cumulative change in weight for each dialysis bag. This was done from subtracting the weight of
each bag from the initial weight of the bag. Doing so, allows the weight of each bag to be initially
zero. For that, we must calculate the corrected cumulative change in weight. For each time interval
of 10 minutes, we subtracted the change in weigh of bag #1 (tap water) from the weight of each bag
at the specific time measure– this corrected any oscillations.
Results The corrected cumulative change in weight due to osmosis from different concentrations of
sucrose and tap water, are shown in Figure One. This figure shows the weight change in grams for
every interval of 10 minutes. Using the corrected cumulative change in weight eliminates bag #1
because its average rate of change will always be zero. Below is a table of the bag weights at 10
minute intervals after being tested for an hour:
| |Bag Weights

Osmosis In Potato Cells
The hypothesis tested was "as the concentration of the sodium chloride solution increases, the
change in mass of the potato cylinders will decrease, from gaining to losing mass, allowing the
isotonic point of the potato cells to be found" which was supported by both the group and class
results. These results showed that increasing the sodium chloride solution concentration allowed it
to approach the isotonic point and then surpass it when the solution became hypertonic and the net
movement of water was out of the potato cells.
The graph is indicative of when the potato was in a hypotonic solution (above the x–axis) there was
a net movement of water into the potato cell resulting in an increase in mass. The opposite is true of
hypertonic solutions (below the x–axis) resulting in a decrease in mass. Where the graph crossed the
x–axis is where the potato cells isotonic point is, this is where the external solution has the same
concentrations as the internal cell cytoplasm
Osmosis is a process by which water moves through a partially permeable membrane down a
concentration gradient. As this net movement of water occurs from high to low concentrations it is a
passive process and therefore does not require energy to occur. There are three types of solutions
that a cell can be in, in relation to which direction osmosis will occur. In hypertonic solutions, there
is a higher osmotic concentration than in the cell's cytoplasm, so plasmolysis occurs. This is where
water moves out

Diffusion of Water Across Plasma Membrane Of RBC'S
b.)Purpose– The purpose of this experiment is to understand diffusion osmosis. c.)Hypothesis– Slide
#1 blood only is isotonic, Slide #2 Blood plus .9% of NaCl is Hypotonic, Slide 3# blood plus 10%
of NaCl is Hypertonic and Slide #4 Sheeps blood and dH20 is Isotonic. II.Procedure– a.)Equipment
Used–
What we need for this experiment
0.9% NaCl
Filter paper
4 clean slides
10% NaCl
Wooden applicator stick
Cover–slips
dH20
1 disposable mat
Microscope
Sheeps blood
Disposable gloves goggles b.)Collection of Data–
Step 1: Make sure you have all of your supplies in front of you. Have all four slides labeled one
through four.
Step 2(PART 1 & PART 2): PART 1: Each student takes a slide. Each student also needs one cover–
slip and filter paper (for excess liquid) PART 2: Read what you are to do before you do it.
Step 3: DO AS TOLD BELOW. DO IT QUICK AND DILIGENTLY. BLOOD WILL DRY OUT
QUICKLY.
Student with slide #1: Use the stick and place a small drop onto each of the slides.
Student with slide #2: Place a drop of 0.9% Nacl on top of the sheeps blood. Cover it with the slip
and Clean extra off with the filter paper. ( Not needed , if no spill)
Student 3# Place a drop of 10% NaCl solution on top of the blood. Cover it with the slip and clean
the extra off with the Filter paper.
Student 4:Place a drop of dH20 on top of the blood. Cover it with the slip and clean the extra off
with filter paper.
Step 4: Look at the slide under 40x , 100x , and high power 400x. Draw

Lab Report On Osmosis And Diffusion
Osmosis & Diffusion lab Report The question that is being asked in this lab is what happens when
the egg is put in an acid bath, water bath, then a corn syrup bath. In the acid bath the egg will do
something to the shell. The hypothesis that was created for the acid bath is that if the egg is put in
the acid bath then the acid will destroy the cell because the acid will eat away at the calcium of the
shell. The hypothesis that was created for the water bath then the egg will increase in mass because
the water starts to fill the egg. The hypothesis that was created for the cron syp bath is that if the egg
is placed in the corn syrup bath the egg will weigh less because the water will leave the egg and corn
syrup eats away ah the egg. The

Shell-Less Egg Lab
Purpose
The purpose of this experiment was to explore how an organism's internal environment is affected
when exposed to different external environments, the eggs modeling humans.
Testable Question
How much will a shell–less egg change in mass if it is soaked in distilled water and Monster Energy
Drink for 30 minutes?
Hypothesis
If a shell–less egg is soaked in corn syrup for 30 minutes, then its mass will decrease by 3 grams.
If a shell–less egg is soaked in distilled water for 30 minutes, then its mass will not change.
If a shell–less egg is soaked in Monster Energy Drink for 30 minutes, then its mass will decrease by
5 grams.
Materials
Safety goggles
Lab apron
4 plastic cups
Corn syrup solution
Distilled ... Show more content on Helpwriting.net ...
Reflection
1.The vinegar is an isotonic environment for the egg. There is already balance in the solutions of
these things. I believe the corn syrup and the monster energy drink weakened the external barrier of
the egg, penetrated the egg through its pores, and caused the egg to release its contents, which

decreased its mass. I think the distilled water wasn't strong enough to negatively weaken the egg's
barrier, but actually strengthen the egg by penetrating to a safe extent, therefore providing benefits .
2.Corn syrup and the energy drink caused the egg mass change percentages of –5.8% and –1.6%,
while distilled water caused an increase of 2.9%. If external environments didn't affect internal
environments, then these results would be flat. Also, after the experiment, our eggs looked plumper
than before the experiment.
3.I was surprised that the vinegar didn't cause a change in the egg's mass. Vinegar was the most
acidic liquid tested, so this makes me wonder if eggs have the same pH as vinegar. Since vinegar
was used to destroy the shell of the egg, my reasoning was that since the shell is stronger than the
inside barrier, then it will destroy that barrier easily as

Osmosis : Finding A Happy Medium Essay
OSMOSIS: Finding a Happy Medium
INTRODUCTION
All living things are made of cells. Cells are the building blocks for organisms from the smallest
bacteria to the largest mammal. These cells require essential elements to survive. One component of
these essential elements is water (Krogh). Water assists in the movement of molecules from higher
concentrations to lower areas of concentration within living cells through diffusion and osmosis.
These processes help maintain an equilibrium between the cell and its environment (Keirle).
Diffusion occurs when there is a concentration gradient of particles in a cell (a portion with a greater
amount of particles in one area and less in another); when given time these particles will on their
own, spread out evenly throughout the same area. When there is a semi–permeable cell membrane,
only certain particles are permitted to enter the domain of the cell requiring osmosis to move water
between the cell and its environment. (Kahn).
Cells must maintain tight controls on osmosis to prevent dying. Too much or not enough water is
harmful, and cells, which include plant cells, know how much water is needed for survival and use
diffusion and osmosis to maintain homeostasis. This process is easily seen without a microscope in
plants. When your houseplant does not have enough water the plant begins to wilt becoming unable
to keep itself upright. Once you water your houseplant you will see the plant stand upright again
(Keirle).
In this experiment,

The Effect Of Osmosis On Potato Cells
BIOL 1208 Writing Assignment 2
Results and Discussion
These are to be written individually even if you worked in a group. This should be written in
paragraph format. Each section should include the answers to the following questions
Lab Topic: Effects of Osmosis with Potato Cells in Sucrose Solution
Introduction:
Small slices of potato are placed in six concentrations of sucrose: 0.0 M, 0.1 M, 0.2 M, 0.3 M, 0.4
M, and 0.5 M. The initial mass of potato is noted before being placed in the solution. The potato
remained in the solution for one hour then the potato was removed from the solution and dried off
before the final mass was noted. The null hypothesis is that the solutions of different molarities of
sucrose will not affect the ... Show more content on Helpwriting.net ...
Once the hour was over, the potato slices were removed from the solution, dried off in a paper
towel, and weighed once again. In the 0.0, 0.1, and 0.2 M of sucrose concentrations the final mass of
the potato increased. Therefore H2O enters the potato cell because the solution is hypotonic. In the
0.3, 0.4, and 0.5 M of sucrose concentration the final mass of potato decreases. The solution is
hypertonic which causes H2O to exit the potato cells through the semipermeable phospholipid
bilayer. The results prove that the different molarities of concentration affect the mass of the potato
in different ways; the mass of potato either increased or decreased depending on the molarity of
sucrose concentration.
Caption: The line of best–fit shows the pattern that as molarity increases in the sucrose
concentration then the percent change in mass of potato decreases.
Discussion:
Determining the Osmotic Concentration of Potato Tuber Cells When Placed in Sucrose Solutions
In this experiment, the osmotic concentration is found with potato slices placed in sucrose solutions.
Osmosis in this model is the net movement of water between the potato cell and the sucrose
solution. The movement of water is determined by the molarity of sucrose. As the molarity of
sucrose increased then the concentration in the solution also increased. H2O will move through the
cell membrane to areas of higher concentration in order to reach equilibrium. If cells are placed

The Phenomena Of Osmosis, Discovered By Rjh Dutrochet
Background information
The phenomena of osmosis, discovered by RJH Dutrochet in 1826, has been a significant area of
interest in biology since. Osmosis is the process of diffusing water molecules through a selectively
permeable membrane to dilute solutions with high concentrations of solutes until that solution has
the same concentration as the solution on the other side of the membrane (Freeman, n.d., p. 96–99).
An important component of osmosis is diffusion, which is when molecules or ions in the presence of
a concentration gradient move from an area of high concentration to an area of low concentration
(Borg, 2003, p. 13). The purpose is to have the same concentration of solutes on both sides of the
membrane and this process generally occurs when the solute causing the concentration gradient is
unable to traverse the selectively permeable membrane. Moreover, it is an example of passive
transport, meaning that it doesn't require energy (ATP).
WeThe original aim of this experiment was to observe and understand the effects of osmosis by
placing a slice of potato in both hypertonic and hypotonic solutions. The objectives have since been
expanded to include observing the effects of a sugary hypertonic solution (sucrose solution) in
addition to the previously used salty hypertonic solution (NaCl). It is unsure if the two solutions will
generate similar outcomes or if one of the two will be more effective in conducting osmosis.
Additional variables that will be added in the

Osmosis To Determine The Mass Of A Potato
If I am to figure out the estimated concentration of sucrose found naturally inside the potato using
osmosis, then there will be a change in the mass of the potato because it will either be hypotonic or
hypertonic to the cell, as it will affect the size of the cell along with in. The 0 M, 0.2 M, and 0.4 M
solutions were are hypotonic to the cell. Hence, they contained less solute than the potato itself.
Therefore, the potato cell increased in mass because water was moving into the cell. It was more
concentrated had less water in comparison with outside the cell, so it moved in. However, the 0.6 M,
0.8 M, and 0.10 M solutions were hypertonic to the cell, causing the potato cell to decrease in mass
as water was moving out of the cell. There was ... Show more content on Helpwriting.net ...
This was because not all of them looked the same in shape. Also, for at least two of the slices we
used the curved ends of the potatoes, this meant parts that should have been there were already not
present for a cube shape. This was bad because much mass was eliminated in comparison with the
cube shaped ones actually coming from the middle area of the potato, where you get a sufficient
amount of the potato to actually use. This could remove more mass. Also, we only peeled off
enough skin as we could, although we did not have too. Some parts were too hard to peel, therefore,
a few potatoes had most of their skin removed, whereas, others mostly had at least half of their skin
remaining. This would also have a role in causing various wrong masses for the initial masses of the
potato, also affecting the final mass after it had been placed into the solution.
The osmosis potato lab is related to some aspect in the human body in that osmosis occurs in our red
blood cells. Osmosis helps us in containing a significant amount of water inside our

Lab 1: Colligative Properties & Osmotic Pressure Essay
Ankur Sindhu Sep 20, 2011 CHEM 182–DL1 Prof.: Dr. Nidhal Marashi Lab 1: Colligative
Properties & Osmotic Pressure Purpose: The purpose of this laboratory was to gain an
understanding of the differences between the freezing points of pure solvent to that of a solvent in a
solution with a nonvolatile solute, and to compare the two. Secondly, osmosis was to be observed to
gain a proper understanding of how the principal of dialysis functions. Procedure: 1. Make a water
bath assembly by doing the following: a. Half–fill the 100–mL beaker with cool tap water. b. Place
crushed ice in the beaker so the water level is just below the top of the a. beaker. The water level
should not be ... Show more content on Helpwriting.net ...
The lid was then placed on the jar and an observation was made and recorded. Observations of the
egg were then made after 12 hours and 24 hours had passed and the observations were recorded.
After 24 hours had passed, the egg was removed from the syrup and rinsed with tap water and
observations were made and recorded. Data Tables and Graphs: Temperature of Distilled Pure Water
Time | Temperature (C) | 0 | 1 | 30 | –1 | 60 | –1 | 90 | –1 | 120 | –1 | 150 | –1 | Temperature of Salt
Water Solution Time (s) | Temperature (C) | 0 | 0 | 30 | 8 | 60 | 5 | 90 | 2 | 120 | 0 | 150 | 0 | Part 2.
Osmosis Observations of Syrup Filled Dialysis Tubing 0 Hours | Tubing limp and filled ⅓ of way
with syrup | 1 Hours | Tubing appears to have accumulated more liquid inside. Still a little limp | 2
Hours | Tubing is now half filled with liquid and is more stiff | 3 Hours | Tubing is ¾ of the way
filled with liquid and is very stiff | 4 Hours | Tubing is almost completely full of liquid and very stiff
| 5 Hours | Rubber band at one of the end of the tubing has come off | Observations of Raw Egg
Time | Raw Egg | Raw Egg in Vinegar | Raw Egg in Syrup | Raw Egg Rinsed off with tap water | 0
Hours | Oval shaped, white, opaque and hard shelled | Oval shaped, white, opaque, bubbles rising
out of vinegar | Oval shaped, large, translucent yellow, no shell | Still soft and small and

Diffusion And The Concentration Of Diffusion
Introduction: The lab used many concepts such as; diffusion is the passive movement of molecules
or particles along a concentration gradient, or from regions of higher to regions of lower
concentration (Biology–Online, n.d). The concentration gradient is a gradual change in the
concentration of solutes in a solution as a function of distance through a solution (Biology–Online,
n.d). Diffusion is a form of passive transport and requires no energy to be completed. Passive
transport is The movement of a chemical substance across a cell membrane without expenditure of
energy by the cell, as in diffusion (The Free Dictionary, n.d). Osmosis is a form of diffusion.
Osmosis is the tendency of a fluid, usually water, to pass through a ... Show more content on
Helpwriting.net ...
This is all a part of a cell's osmoregulation. Osmoregulation means the physiological processes that
an organism uses to maintain water balance; that is, to compensate for water loss, avoid excess
water gain, and maintain the proper osmotic concentration (Biology Encyclopedia, n.d) The purpose
of this experiment is to observe how tonicity of a solution effects effects a cell. An egg will be used
to represent a cell, corn syrup as the hypertonic solution, and water as the hypotonic solution. My
hypothesis is that if you place an egg in corn syrup it will decrease in volume, and when placed in
water, it will increase, this is because of osmosis and how diffusion works. First, The egg will be
placed in vinegar for two days to expose a semipermeable membrane. All changes will be recorded.
Next, egg will then be placed in corn syrup for twenty four hours, and all changes will be recorded.
Finally the egg will be placed in water for twenty four hours and any changes will be recorded
Materials and Methods: The following materials will be needed per egg: an egg, 1 beaker 250mL, 1
graduated cylinder, 150mL vinegar, 150mL corn syrup, 150mL distilled water, plastic wrap, rubber
band. The procedure is as follows:
Fill a graduated cylinder to 150mL with vinegar
Pour into beaker
Place egg into beaker with the vinegar
Leave

Potato Osmosis Lab
Osmosis Lab
By Anthony Grimes
3/2/17
Per 2.
Abstract
What is being tested in this lab is the properties of osmosis and its hypertonic ( water coming out of
the cell), isotonic (everything is normal), and hypotonic (water going into the cell). What is being
tested is eggs and potato slices so we can test plant and animal cells for the best results. For the
results what was predicted was The eggs (the animal cell) will lose the outer shell and in the distilled
water water will enter the egg and it will swell up and in the corn syrup water should heave the egg
and in the egg white is should stay the same. And in the potato slices with no salt in the water water
should go in and as we go from 5% to 10% to 15% more and more water should ... Show more
And the opposed brought water in.
Conclusion
The lab was a success we were able to show that osmosis is a thing and how it works in side of plant
and animal cells, The potatoes and the egg did what was supposed to happen as more and more salt
came into the solution the more water was pulled out of the cell and reversed and they were gaining
water and adding and lose 20 to 30 g of water weight because of osmosis. If there is more salt in the
solution then there will be more and more water pulled out of it. And this was 100% true because
that is what happened during the lab. What we could have changed is pre soaking the potatoes and
the eggs before the lab because that was an error the first time. And if i were to do anything
differently i would have tried different solutions to see what would happen. And I would have
different animal and plant

Disintegration Of Egg Lab Report
In this report we are trying to answer the question, what acidity is most effective for disintegration
of egg shells? The acidity that is most effective for disintegration of egg shells is the pH of the
orange juice because according to are results the orange juice versus the other two liquids and their
respecting pHs. We looked at changes from day 1 to day 5. We subtracted the value of day 5 from
day 1 to get what we call the difference. We found that the orange juice had the greatest differences
in surface area and volume from day 1 to day 5. The differences were 7808.24 mm for volume and
for surface area average difference was 2684.57 mm. The Antacid had the second greatest change
while water changed the least from day 1 to day 5. The difference ... Show more content on
Helpwriting.net ...
(2011) states that pH under 5.5 dissolves tooth enamel which is has the same composition of egg
shells. Our results show that the orange juice which has an acidity under 5.5 affected the egg shell
the most in concern with pH. Our results support the literature with quantitative evidence to what
they are saying. For example, Right (2015) says that sport drinks, sodas, and other acidic drinks are
positively correlated with dental erosion. Our results also show that orange juice had effected
greatest average change of surface area and volume. And we give numerical evidence to the
literature. Furthermore, our results agree with what Okunseri et al. (2011) state that in the United
States that a majority of younger kids drink more acidic beverages like juices and sodas over water
and milk, juices and sodas were found to be associated with erosive teeth wear in a study of children
around the age of 12 in Leicestershire, United Kingdom. Our results had the greatest difference in
surface area and volume with the more acidic beverage which was the orange

Tonicity And Osmoregulation Lab Report
Introduction:
The experiment is done to visualize tonicity and osmoregulation in a mock animal cell for
comprehension of the concept. A grape will be used for the representation and exposed to three
different tonicities. The changes or lack thereof in weight can show the movement of water to
balance its tonicity through osmoregulation. The predicted results with the green grapes in solution
after four days of research will be reflective of how a hypotonic, hypertonic, and isotonic cell will
react. The hypotonic solution will cause the grape to shrivel noticeably and be slightly browned,
leaving it with less weight. The hypertonic solution will cause the grape to have the outer skin torn,
starting from the where the stem attached, the grape should be expanded as well. The weight will
increase. The isotonic solution will have little change, still plump and the same weight.
Background Information:
Tonicity is the ability of a surrounding solution to cause a cell to gain or lose water, depending on
the concentration of solutes in the solution and the cell. There are three states of relative tonicity,
isotonic, hypotonic, and ... Show more content on Helpwriting.net ...
The objective to visualize and understand tonicity and osmoregulation can be concluded as
complete. Campbell Biology states that the hypotonic solution will cause water to move into the cell
(increasing its mass), and the hypotonic solution having water leave the cell (decreasing its mass),
and the grapes both revealed these results (2015, p. 77). It was predicted that the hypotonic will gain
mass and burst, the hypertonic to shrivel and lose mass, and the isotonic to not change mass. Two
out of three are reflected in the quantitative and qualitative data. The hypotheses were decided to
match the data on what would happen to a real cell, and were

Purpose Of Osmosis Lab
Abstract The purpose of this experiment is to observe the osmosis process in which molecules of a
solvent pass through a semipermeable membrane. This experiment is conducted to find out which
kind of osmosis process is taking place in each of the three experiments. The sheep's blood is placed
into three different types of solutions. These solutions have increased concentrations of NaCl.
Hypotonic solutions have a lower solute concentration compared to the sheep's blood. Since
hypotonic solutions have lower concentration of solutes, it allows the water to come in to the cells.
Consequently, hypotonic solutions cause the cell to be bloated and burst or lyse. Isotonic solutions
have the same solute and water concentrations as compared to the ... Show more content on
Helpwriting.net ...
Water molecules still move in and out of the blood, but there is no net gain or loss of water from the
cells. Therefore, the cells remain the same size. Hypertonic solutions have a higher solute
concentration compared to sheep's blood. Since, hypertonic solutions have higher concentration of
solutes they have a lower concentration of water and that causes the water to leave the cell.
Therefore, hypertonic solutions, cause the cell to shrink or crenate. (Mathieson, 2013). The sheep's
blood is then placed into four different slides, and then different solutions are dropped into each
slide. The solutions are .9% NaCl, 10% NaCl, and dH2O. A microscope was then used to observe
any changes that occurred to the cells. Slide one was the controls slide and there was no change to
the cell. Slide two had an isotonic solution, and the cells remained the same size. Slide three was a
hypertonic solution, and cells shrunk. Slide four was a hypotonic solution, and the cells ruptured
because of the

Osmosis Egg Lab
In this lab my hypothesis " I think when placing the raw egg in vinegar the shell will disappear and I
will be left with a rubbery, squishy shaped egg. When I place the egg in corn syrup the egg will
separate and shrink because the molecules won't be able to pass through the egg. When I place the
egg in water it will expand slightly because of diffusion." was pretty spot on. When we left the egg
in vinegar it came out like a bouncy ball and when placed in the corn syrup it shrunk. Finally, when
the egg was put in water it expanded like I predicted. Because of the varying concentrations in each
substance the egg expanded and shrunk. The results of this lab demonstrate and show that various
concentrations in substances can cause something ... Show more content on Helpwriting.net ...
After the 24 hour period we came back to find an egg without shell. It had dissolved and left a
rubber, bouncy ball like shaped egg. This is because the acidity of the vinegar mixed with the
calcium of the eggshell to dissolve it and the water of the vinegar traveled through the membrane of
the egg causing it to fill and resemble osmosis. After analyzing the results of the vinegar we rinsed
the beaker and filled it with 150 mL of corn syrup. We placed the egg in the beaker and set it for
another 24 hours. The next day we came back to discover a shrunken egg. This is because corn
syrup hypertonic has a lower concentration of water than the egg therefore the water from the egg
moves through the membrane and into the corn syrup to equalize the concentration. After looking at
these results we cleaned the beaker and filled it with water. We placed the egg in the water and left
for the final 24 hours. When we came back to look at the final results of the lab we found the egg
had expanded and filled back up to about its original size. This is because the water is hypotonic and
the egg has less water concentration than the water. Therefore the water molecules move into the
egg instead of

What Happens When Salt Float In Egg Experiment
The purpose of our experiment is to see how salty it is for an egg to float. When salt is added to
water, the mass of the water increases, and the water becomes denser. Objects will float better on a
denser surface, they float better on salt water than they do fresh water. When you add table salt to
water the salt dissolves and the water becomes denser, the volume increases by a small factor but the
mass increases by a large factor. The salt is denser than water to begin with, because the salt has
more mass than oxygen and hydrogen in the water molecules. Salt are more iconic compounds that
are formed when the cations of a base and the anions of an acid combine. When the atoms combine
they don't have a negative or positive charge. When certain bases and atoms combine, they form
water and a salt. Salts also have the ability to form crystalline soils are three dimensional ... Show
more content on Helpwriting.net ...
When you drop the egg into water, it will sink through the plain water until it reaches the saltwater
at the bottom of the glass. The density of the saltwater prevents the egg from sinking any lower, so
the egg will float in the middle of the glass. What happens when you put an egg in water? After you
dissolve the eggshell, the egg is surrounded by a membrane which is bugger molecules. When you
put a plain egg in corn syrup, you are creating a situation where the egg membrane separates two
solutions with different contractions of water. Do eggs float in saltwater? If you put an egg in a cup
of tap water, it will sink to the bottom. When enough salt is added to the water, the saltwater
solution' s density becomes higher than the egg's, so then the egg will float. Why would an egg get
smaller in saltwater? Eggs are covered with a semi–permeable membrane, which allows molecules
to pass through. When an egg is not shelled and you put it in saltwater, molecules pass from the egg,
through the membrane, into saltwater

Osmosis : Observing Elodea Leaves And Plasmolysis
Observing Elodea Leaves and Plasmolysis
In this lab we observed elodea leaves with different solutions on them using microscopes that
produced magnifications of 100 times and 400 times. We observed elodea leaves with drops of
water on them, we dropped a ten percent solution of salt and water on the elodea leaves, and we
later observed the elodea leaves with distilled water on them after the salt solution was washed off
the leaves. We observed changes in the plant cells when we dropped different solutions on the leaves
and watched the cell's shape change. We didn't learn about osmosis before doing this lab, so I did
not have any educated expectations of what would happen in the lab.
I observed the elodea cells with salt water on top of them and saw a gap between the cell wall and
the cell membrane that I did not see using tap and distilled water on the elodea leaves. Before salt
water was added to the elodea leaves and a drop of water was on the leaves I observed that the cells
were green, all cells were about the same sized rectangles and there was not a noticeable gap
between the cell wall and cell membrane. After adding two drops of salt water onto the elodea leaf I
saw green and rectangular cells and chloroplast under the magnification of 100. Although, under the
magnification of 400 I observed that there was a larger gap between the cell wall and the cell
membrane, called plasmolysis, and I was able to identify the chloroplast, cytoplasm, and the cell
wall. The cell

Essay on Osmosis in Onion Cell
The aim of the sixteenth of November experiments was to observe how three different solutions
with various sucrose concentration influenced osmosis in relation to three onion cells and the impact
on the cells structure. A small square of a red onion skin (membrane) was observed under a
microscope at high power (X40) magnification. The observation showed a large number of onion
cells. The structure of one onion cell had a general rectangular shape with a developed cell wall,
which gives the rectangular shape to the cell and a cell membrane just beneath it.
The observation under the microscope of a cell of an onion skin soaked for 15 minutes in distilled
water showed that the cell membrane was pressed against the cell wall. The cell ... Show more
The lost of water from the vacuoles and cytoplasm pulled the cell membrane away from the cell
wall. The water was diffused from a hypotonic solution to a hypertonic solution. Because the water
flowed out of the cell by osmosis, the cell became more flaccid and then plasmolysed.
The observation under the microscope of a cell of an onion skin soaked for 15 minutes in a 0.5
molar sucrose solution showed a cell membrane just beneath the cell wall. The cell wall had a
rectangular shape. See diagram 3 for sketch. The cell and its surrounding were in an isotonic
solution. The two solutions in the cell and out (0.5 molar sucrose solution) of the cell were
homogenous. No net movement of water and change in the cell structure was observed. The
components of the solute and solvent were evenly intermixed. The concentration of solute and
solvent on either side of the cell membrane was equalized. Because the onion tissue didn't get any
water the cell was flaccid and nonturgid.
Those three experiments showed that the way onion cells are dealing with the movement of water in
and out of the cell is by osmosis. That Osmosis is the diffusion of water across a membrane into a
solution having a greater solute concentration. The cell

Lab Report On Plasmolysis
Lab RECAP: Plasmolysis In this lab we learned about plasmolysis. We completed this lab to study
the effects of salt and distilled water on elodea cells. We first took a leaf of an elodea plant and
placed it on a slide with a drop of distilled water. We then placed a cover slip over the leaf and
observed the leaf under a compound microscope with lenses that magnified the cells 100 times and
then under a lense that magnified the cells 400 times. We then recorded what we saw by drawing a
couple cells in each power. Next, we placed a drop of saltwater on the same leaf and observed it
again under the same two magnifications. We recorded what we saw by drawing a the group of cells
that we saw. Finally, we added a drop of distilled water to wash out the salt water and repeated the
procedure of observing and recording at the two different powers. I knew that salt dissolves in water
and that the salt may affect the water levels within the cell. I also knew that when salt was exposed
to a plant, the plant wilted. However, I did not have a good understanding of plasmolysis, so I did
not have an idea on what was going to happen to the cells during the lab.
When I looked at the cells with a drop of distilled water, I saw a rigid cell wall that surrounded each
cell. I also saw a cell membrane that lined the cell and green chloroplasts that lined each membrane.
The whole cell had a green hue and the chloroplasts were a brilliant green. I saw tiny cells with
green circles moving inside of them under the 100 times magnification. However, in the 400 times
power, I could see the separation between the cell wall and the cell membrane more than in the 100
times magnification. The cell's volume did not surpass the cell wall. When I added a drop of salt
water to the leaf, the cell wall remained in place, whereas the cell membrane shrunk and did not line
the cell wall as it was with the distilled water. The chloroplasts moved with the cell membrane and
were closer to the each other. The chloroplasts were compressed together when the cell was exposed
to salt, whereas in the distilled solution, the chloroplasts were able to move freely. When the
plasmolyzed cells were under the 100 times magnification, I could see the shrinkage of

Osmosis and Diffusion Lab Report Introduction All Cells...
Introduction
All cells contain membranes that are selectively permeable, allowing certain things to pass into and
leave out of the cell. The process in which molecules of a substance move from an area of high
concentration to areas of low concentration is called Diffusion. Whereas Osmosis is the process in
which water crosses membranes from regions of high water concentration to areas with low water
concentration. While molecules in diffusion move down a concentration gradient, molecules during
osmosis both move down a concentration gradient as well as across it. Both diffusion, and osmosis
are types of passive transport, which do not require help.
When the concentration of the environment outside of the cell is lower than the inside ... Show more
However one beaker received 100 mL of Deionized water with a molarity of 0.0. Afterwards a cork
borer was pushed through the potato and was twisted back and forth. Once the borer was filled it
was removed from the potato. Pushing the potato cylinder out of the borer, this this step was
repeated six more times in order to get seven undamaged potato cylinders. Using a sharp razor
blade, the potato cylinders were both cut to a uniform length of about 5cm, and were removed of
their potato skins. The potato pieces were also cut in half to give the cells a greater surface area in
which it was easier to absorb the solution. After the cylinders were weighed on a balance and the
data was recorded in Table 4. Using the razor blade each potato was cut lengthwise into two long
halves. Then the potato pieces were transferred to the water beaker and the time they were
submerged was recorded. This step was repeated for all potato cylinders in which the pieces were
placed in solutions 0.1 to 0.6 M. The potatoes were incubated for ninety minutes. At the end of the
incubation period the time was recorded. Then the potato piece was removed form the first sample.
Next potato pieces were weighed the and the final weight was recorded in Table 4. This procedure
was repeated until all samples had been weighed and recorded in the chronological order they were
initially placed in the test solution. Afterwards the table was completed by recording the

Osmosis Lab Report
AIM
The aim of the experiment was to observe the effects the concentration as on the rate of osmosis.
HYPOTHESIS
The smaller the amount of concentration the quicker osmosis will occur.
VARIABLE
Independent variable: concentration of glucose
Dependent variable: rate of osmosis CONTROLLED VARIABLES: 1. Time
2. Height of funnel
3. Amount of water
4. Height of glucose bag in the beaker
APPARATUS
1. Thistle funnel
2. Distilled water
3. 500ml breaker
4. Retort stand
5. Clamp
6. Cellulose bag
7. Two rubber band
**SET APPARATUS AS DISPLAYED ON THE DIAGRAM BELOW**
METHOD
1. Distilled water into the breaker.
2. A knot was tied on one end of the dialysis tubing. At the other end of the thistle a stem was
inserted. So air was avoided ... Show more content on Helpwriting.net ...
Meaning, that the relationship between concentration and rate is that they were directly proportional.
This can be seen through the comparison of 20% and 10% average rate which were 1.575 to 0.735
and 30% to 20%; 4.22 to 1.575. The data has proven the hypothesis wrong as it was stated that "the
increase on concentration decreasing the rate".
The biological explanation for these results is that; osmosis occur at a quicker rate when the
concentration is increased. Supported by the evidences above.
ERRORS
During the experiment a group doing the 10% experiment had split their glucose into the water
when trying to fasten the bag. This had effected the average glucose level for the 10%. This is

supported by the
Random
Possible random errors that occurred are timing of recording of data is not consistent. The level of
solution glucose maybe have been disturbed when making the funnel. Which can increase the
glucose in the water.
IMPROVEMENT
The experiment needs to be timed for a longer time period to have more accurate data. The
experiment to should have a least three participants to step the diagram above so no systemic errors

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