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Title: An investigation into the affect of different concentration
salt solutions on potato tissue
Aim: .I have to find out the effect of varying salt concentrations on
a potato tissue. Also to find out how osmosis occurs with different
salt concentrations from very dilute to very concentrated. I will be
looking for any changes in mass and length
Prediction: I predict that the most concentrated salt solution (1
molar) will be the solution that will have the most dramatic effect
upon the tissue of the potato. As the solution goes down the line in
other words gets more and more dilute or weaker it will have a less
distinctive effect upon the potato tissue. This will happen due to the
high concentrated solution i.e. the 1 molar salt solution moving
across into a low concentrated are i.e. the potato chip. The potato
chips that are in the most concentrated solutions will be the ones,
which will lose mass. The potato chips which will be in the diluted
solutions will gain more mass this is the actual osmosis scientific
theory. Osmosis is the movement of water molecules from an area of
high water concentration through a semi-permeable membrane to an area
of low water concentration. This is very similar to diffusion and
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Partially Permeable Membrane
= Solute Molecules
[IMAGE]= Solvent Molecules
Preliminary Experiments: Visking Tubing Experiment
This is a thin plastic with microscopic holes, which allow small
molecules to pass through
To observe the process of osmosis in an experiment
* 2 Beakers filled with sodium chloride of different concentrations
* 2 Visking tubes filled with water
* Elastic Band
1. Tie one end of a Visking tube with a rubber band tightly
2. Fill the Visking tube up with water and seal the remaining end with
3. Do this for 2 tubes
4. Fill one beaker with sodium chloride 0.2 solution
5. Fill the other beaker with sodium chloride solution 0.8
6. Drop 1 Visking tube in each beaker and wait 20 minutes
The process of osmosis has taken place in the two beakers. The
concentration level of NaCl 0.2 was low therefore the tube was harder
than the other tube. More water moved out from the tube in
concentration 0.8 NaCl than in the low concentration NaCl of 0.2.
· Concentration of salt solutions. I will have a range of different
salt solutions to ensure that my results are accurate and mixed. This
will also help me investigate the fact where osmosis is used the most.
· Mass changes in grams of potato chips/discs. To make the results
more reliable I will measure the potato chips mass before and after
the investigation. This shows more accurate results
1.temperature: my investigation will need to be carried out in a
2.time period: To make the investigation fair the time period needs to
be controlled. The experiment will be done in the 4th period and the
results will be collected the following morning at 8:15am
3.type pf potato tissue:
The potato tissue I use to make my chips needs to be the same .It
needs to be cut washed or boared with the same method.
4.type of solution: As my solution will be different for my every
range I will only decrease the 1 molar salt solution by 10cm3 each
time. The total amount of solution will be 50cm3
5. Size of potato discs:
The surface area will vary if the potato chips aren’t the same size.
Which will affect the osmosis process-taking place. This will by
controlled by making each potato disc 10mm
Potato x 1-this will be our experimenting tissue. It will have to be
the same potato and will have to be treated in the same way.
Blotting Paper x 2-I will use this after my experiment. I will take of
any excess water of the disc when I am measuring the mass after.
100ml Beaker x 6-A test tube would be too small and there would be a
danger of spillage. As we are only using 50cm3 of solution there will
this beaker is more suitable
100ml Measuring Cylinders x 2-As both solutions are different (one is
distilled water and one is salt solution) I will be using two
White Tile x 1-this white tile is ceramic and will only be used for
safety purposes and to stop any damages towards the school property.
Distilled water x 1 bottle-Tap water is not exactly pure so it would
affect my results.
1 mol/dm3 Salt Solution x 1 bottle-for all my solutions the same
strength will be used.
Cork Boarer x 1-there are two types of cork boarers they differ in the
diameter, I will use the thin one and keep using the thin one.
Scalpel x 1-The scalpel is extremely hard and extremely dangerous. It
will be used to cut up the potato discs.
Ruler x 1-the ruler will be used to measure 10mm of each potato disc.
Electric Scale x 1-these will be used to measure mass before and after
All these apparatus will be obtained from the technician’s room on the
1. For safety precautions my work surface will be cleared from any
objects that are not needed such as book, diary pencil case etc. I
will remove any barriers. Also I will put my chairs on a side, as
I will have to be standing up to check the measurement of
solution. Someone else may stumble over the chairs so that’s why I
will put them away.
2. We are going to be using concentrated salt solution. This may not
be that dangerous, but if we get it into our eyes then we will see
further implications to this. To prevent this I will be wearing
goggle provided by the biology department.
3. As we are using glass beakers I need to hold them very carefully.
If they do slip or fall out of my hand I will make sure no one
goes near it, as it will be a safety hazard to others. I will get
a dustpan and brush and quickly clear it up.
4. Whilst I am using the scalpel I must not walk around the room
with it in my hand. I should always cut upon the white tile to
prevent injuring others or myself.
5. Electricity conducts any type of liquid, so when I am using the
electric scales I must avoid any spillage of the concentrations.
6. Any potato left on the work surface should be cleared away
immediately from the surface and the floor as it is a slipping
7. To stop bacteria from multiplying before and after the experiment
wash your hands and wipe the work surface with a damp cloth.
Firstly I will need to prepare 6 different solutions.
1. The first solution will be 50cm3 of distilled water. I will measure
out 50cm3 in one of the 2 100ml-measuring cylinders. To make sure I
have the accurate amount of liquid in the cylinder I will look at it
at eye level this will make my results more accurate. When it is
measured I will pour it into a 100ml beaker and then I will label the
beaker stating which solution it is and how much it has. This will
help me when it comes to me finding my results it will make the
process more efficient.
2. The second solution will be a 1 mol/dm3 Salt Solution. I will
measure this 50cm3 of this out in another 100ml measuring
cylinder. Again to make sure the same amount of liquid is poured
in I will look at it at eye level. After I have measured it out I
will pour it into another 100ml beaker and then label the beaker
stating which solution and how much it has.
3. The third solution will be 40cm3 of 1 molar salt solution. I will
measure this in the previous measuring cylinder used for the salt
solution. I will pour in 40cm3 and check it at eye level. Then I
will pour it into a third 100ml beaker and label it with the
amount and type of solution. I will get distilled water and
measure out 10cm3 in the measuring cylinder I used for distilled
water and check it at eye level. After I have measured it I will
pour it into my beaker, which contains the 40cm3 of salt solution.
I will have to label it
4. The fourth solution I will be making will be 30cm3 of 1 molar
salt solution .I will measure it in the salt measuring cylinder
and check it at eye level. Then I will pour it into the fourth
beaker. Then I will get the water measuring cylinder and measure
out 20cm3 of distilled water I will then check it at eye level.
Then I will pour it into the beaker, which contains 40cm3 of salt
solution. I will then label it.
5. The fifth solution I will be making will be 20cm3 of 1 molar salt
solution. I will measure it in the salt measuring cylinder and
check it at eye level. Then I will pour it into the fifth 100ml
beaker. Then I will measure 30cm3 of distilled water in the
water-measuring cylinder. Then I will check it at eye level and
pour it into the beaker containing the 20cm3 salt solution. Then I
will need to label it
6. The sixth and final solution will consist of 10cm3 of 1 molar
salt solution. I will measure this in the salt measuring cylinder
and check it at eye level. Then I will pour it into the sixth
beaker. I will then measure 40cm3 of distilled water in the
water-measuring cylinder and check it at eye level. I will then
pour this into the beaker along with the 40cm3 salt solution.
7. Next I will need to prepare 18 potato discs/chips each of the
length 10mm.I will obtain 18 out of 1 potato need 18 as I will be
placing three discs in each test tube for more varied and reliable
results. I will not wash it or peel it will need the white tile a
scalpel a pencil a ruler and a weighing scale.
8. I will place the white tile upon my work surface. On the white
tile I will place the potato. I will get the thin cork boarer and
push it through the potato. Then to get the potato chip out I will
use the end of a pencil to get it out.
9. The ends of the potato will have the skin on them. I will
carefully cut it off by using a scalpel. then I will get a ruler
and measure each potato disc at 10mm.i will only do this for
maximum accuracy.i will have to do this six times as 3 discs can
be obainted from 1 potato stick.
10. I will have 6 groups of three potato discs/cylinders. As three
will go into each beaker of solution.I am putting three chips in
each beaker because my results will be more reliable.
11. Then I will eacgh potato disk befor I put it into the beaker.I
will place the weight on my table of results. Then I will work out
the average of it.
12. I will place three discs in each beaker.I will leave them there
in my 4th period and come and check the after weights the next
13. The final bit of my experiment will be to record the weight
after osmosis has takien place.
14. I will take out the three potatoe chips and dry them on blotting
paper.I will then weigh them and record my results. I will do this
6 times for each beaker.Then I will calculate the average after
and change in averages.
15. I will be able to know if osmosis has taken place if when
plotting my graph I see an s shape.
1.0 1.1 1.0
0.9 0.7 0.8
1.1 1.1 1.1
0.7 0.7 0.7
1.0 1.0 1.0
0.8 0.7 0.8
1.0 0.9 1.1
0.9 0.9 0.8
1.1 1.1 1.0
1 1.1 1.1
1.1 1.1 1.0
1.5 1.5 1.5
I would collect this data manually and there will be no need for me to
use any calculator
I calculated these results as I used a calculator to find out the
average. This was done as I added the 3 masses and divided them by 3
Analysing my graph it shows me the higher the concentration of my
created solution the more mass the potato chip lost. Yet the lower the
concentration of my created solution the more mass it gained. My line
of best fit is approximately like my predicted one. Which shows that
my experiment is accurate and reliable. The more concentrated the
solution was the more mass the potato chip lost. The more dilute the
solution was the more mass it gained. The pattern of my graph was
going quite normally until I reached the 100% concentrated solution.
Here I could see a visible anomaly that caused my graph to shape out
of its trend. On my predicted graph the trend was a flat region at the
top an inward curve and a flat region at the bottom. The predictive
graph is very similar to my graph that is supporting my data. My line
of best fit shows that as the concentrated solution increases the mass
of the potato decreases. I can see this, as it is a negative line of
best fit. I don’t think my anomaly should be taken into consideration
as it is minor and does not differ very much. During osmosis I noticed
that my potato chips expanded. In the 0 dm3 solution after I
calculated the change in average was +0.43.The only reason the potato
chip increased mass was because osmosis took place in the potatoes
vacuole. This is because it was a plant cell not an animal cell. As
the concentration of the created solution was 0.8 dm3 the change in
average was –0.4.the surface area became smaller. And the vacuole lost
The appearances of the potato chips were very interesting. You could
tell straight away whether a potato had lost weight due to it looking
shrivelled. You could also tell straight away if the potato chip
gained mass due to its expanded surface area and increased thickness.
Overall I think my experiment was very successful. The first
prediction I made at the beginning of the investigation has also been
effectively proved and supported by my data, by my results. I
predicted that the high concentrated solution would cause the potato
chip to lose more weight whilst the low concentrated solution would
cause the potato to gain weight. I also predicted why this effect
would take place. It would be due to the osmosis process-taking place
in the plant cells vacuole. When the vacuole has osmosis-taking place
it will expand and if solution is a high concentration then the
vacuole will lose its solution and become shrivelled.
Osmosis is the science theory of water molecules moving from a high
concentration to a low concentration. When I created my high
concentrated solutions and placed the potato chips into them they lost
weight. This is due to the water molecules from the solution trying to
move to a low concentrated area i.e. the potato chip. When I created
my low concentrated solutions and placed the potato chips into them
they expanded and gained weight. This is due to the water molecules in
the solution of a low concentration therefore as the process states
the y would move to a highly concentrated area. This is why the potato
All the above is what I experienced and predicted. So therefore I
think my results are reliable and precise as the support, justify and
prove my given prediction.
My experiment result as there was no radical changes in the masses of
the chips. I had one anomalous result from my data. Even though my
results were accurate and I controlled all variables I still managed
to get an anomalous result.
Taken as a whole I was really dependant on my method. If I didn’t have
my method I know for a fact that I would not be able to do the
experiment. As I did have a detailed method to help me can prove it
had no problems and it is a good method because my results and graph
I think this result occurred due to me trying to get excess water of
the potato by using blotting paper. You can’t really measure if you
have got all the excess water off and you are using the paper equally.
This anomalous result could have been prevented if I didn’t use
blotting paper at all but this would have still had some side effects
towards my results.
Another area, which I could of, improved would have been the time
period as I only left my chips in the solutions for 12 hours. I didn’t
really know that osmosis had fully taken place. However if I had left
them for 24 hours then I would be assured that osmosis had fully taken
place and my results would be precise and consistent.
The last thing I would improve would be to develop the variety of
concentrations I used for this experiment. If I had 12-14 created
solutions instead of 10 then my results would have been accurate. From
this I would receive better and more results for my graph and my line
of best fit would be correct and accurate.
Instead of a potato tissue I could of used an onion cell or a fruit
cell such as an orange. Then After I completed both experiments and
shaped graphs for them I could evaluate them and I could see if the
process was similar or diverse.
I think my results drawn were reliable. There were a good variety of
results taken. But they didn’t vary drastically. This shows me that my
results were accurate. Also as I received an anomalous result I think
that tells me that my results were accurate
In general I think my experiment went quite well and was planned
correctly by myself. The results I produced from this experiment were
accurate as they backed up and justified my prediction.