The Solute Concentration of a Potato

The Solute Concentration of a Potato

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The Solute Concentration of a Potato


To find out what the solute concentration of a potato is,
this shall be done by finding out the effect of Osmosis on a potato.

Prediction: That if there is more water outside the potato than
inside, the potato will increase in size. If however there is less
water outside the potato than within, then I shall expect the potato
to shrink in size. I think this because of the laws of Osmosis.

Osmosis is the diffusion of water through a partially permeable
membrane from a high concentration gradient, to a low concentration
gradient.

[IMAGE]

When there is a situation, such as above, the big particles on the
right cannot fit through the partially permeable membrane. However the
smaller water particles can fit through, and so they spread out to
even the pressure, and spread the concentration equally. As shown in
the diagram below:

[IMAGE]

If we say that the right hand side in picture 1 is the potato, and the
left hand side is the beaker of sucrose-water solution, then if there
is more water in the left hand side (as there should be until we are
using 0.6m solution) then the potato should increase. If there is more
water on the right hand side (as there should be from 0.6m solution
onwards) then the potato should shrink, as water leaves the potato and
enters the beaker.

Scott Bissett 10B

[IMAGE]




Apparatus: Corer, Knife, Tile, Potato, Measuring cylinder (10ml), 8
test tubes, Distilled water, Sucrose, Ruler [IMAGE]

1.

Method:

Core the potato 8 times.

2. Cut each core into lengths of 3cm

3. Make sure there is no potato skin on the cores

4. Fill a test tube with 10cm³ of distilled water (0m)

5. Fill another test tube with 9cm³ of distilled water, and 1cm³ of
sucrose (0.1m)

6. Fill another test tube with 8cm³ of distilled water, and 2cm³ of
sucrose (0.2m)

7.

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Related Searches

Fill another test tube with 6cm³ of distilled water, and 4cm³ of
sucrose (0.4m)

8. Fill another test tube with 5cm³ of distilled water, and 5cm³ of
sucrose (0.5m)

9. Fill another test tube with 4cm³ of distilled water, and 6cm³ of
sucrose (0.6m)

10. Fill another test tube with 2cm³ of distilled water, and 8cm³ of
sucrose (0.8m)

11. Fill another test tube with 1cm³ of distilled water, and 9cm³ of
sucrose (0.9m)

12. Fill another test tube with 10cm³ of sucrose (1m)

13. Put each core into a different test tube

14. Label each tube with amount of sucrose in it

15. Wait about 40 mins

16. Take out potato, dry and then measure potato

17. Repeat experiment 2/3 times, and then take an average


Scott Bissett 10B
-----------------


[IMAGE]Preliminary Before this experiment we did some preliminary
work. From this work we
-----------------------------------------------------------------


Work know that the potato will grow in certain solution, and shrink in
others. However in our preliminary work we only left the potato in the
solution for 30 minutes, and there was not a lot of change. Thus we
will now leave it in for at least 40-60mins.Another way to improve the
results is to make the


potato's surface area larger by using a larger borer. With an
increased surface area, the area where osmosis can take place is
larger.

Fair Test: Many things could affect this experiment so we will have to
be careful. For example, we will need to be careful of many key
variables. All these things need to be kept the same between the
experiments: Temperature, size of potato core, exact measurements for
solutions and also that all our equipment is clean.

In order to keep the results reliable, we will obviously need to
repeat the experiment 2 or 3 times to make sure of a fair test.

Other factors that may affect the experiment is the light that acts on
the potato. Also the length of time that the potato is in solution
will affect the percentage of the potato. And as I am measuring the
mass of the potato I have to make sure that I dry excess water out of
the potato before and after the experiment. One other thing that could
affect the potato is that chances are we will need more than one
potato in order to get enough cores, and that there is a possibility
of getting very different potatoes without realising.

Safety Precautions: As with all experiments, some safety precautions
will need to be taken. For example, we are using a sharp knife, which
we will need to be careful of. We also need to be careful not to get
any of our solution into our body, as we don't know what could follow
that.

Scott Bissett 10B

EXPERIMENT 1




Results:

Original Mass

Final Mass

Change in mass

Percentage Change

EXPERIMENT 2




Original Mass

Final Mass

Change in mass

Percentage Change

EXPERIMENT 3




Original Mass

Final Mass

Change in mass

Percentage Change
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