The Effects of Sucrose Concentration on Osmosis in Potato Chips

The Effects of Sucrose Concentration on Osmosis in Potato Chips

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The Effects of Sucrose Concentration on Osmosis in Potato Chips


Problem
=======

What is the effect of sucrose concentration on OSMOSIS in potato
chips?

Introduction/Plan

Osmosis is the diffusion of water from a dilute solution to a more
concentrated solution through a partially permeable membrane that
allows the passage of water molecules but not solute molecules.

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Pure water Sugar dissolved in water

We can investigate this by placing a potato chip into pure water and
weighing it before and after it is placed in the beaker of liquid. I
then will gradually increase the concentration of the sucrose solution
to see what effect this will have on the mass of the potato chip.

Independent Variable

· I am going to change the concentration of the sucrose/sugar
solution.

Dependent Variable

· I am going to measure the mass of the potato chip and the amount of
liquid in the beaker.

Controlled Variables

· To make this a fair test I will need to make sure I:

· Use the same size of chip (2mm)

· Get rid of excess H2O

· Use the same volume of solution (25ml)

· Use the same surface area

Prediction

I predict that at the start of the investigation, the mass of the chip
will increase, but later the mass of the chip will begin to decrease.
This is because the water moves from a dilute solution to a more
concentrated solution. This is known as osmosis.

The reason the mass of the chip gradually increases at the start is
because there is a high concentration of water outside the chip and a
low concentration within the chip. This causes the water to enter the

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chip by osmosis. The chip will weigh more after removal.

The chip then begins to decrease in mass because the sucrose solution
has a lower concentration on water and the chip has a higher
concentration of water. This causes the chip to decrease in mass as
the water leaves the chip by osmosis. The chip will then weigh less
after removal.

Apparatus

· Scalpel

· Tweezers

· 12 Beakers

· Scales

· Core-pore

· Potatoes

· Sucrose solution

· Ruler

METHOD

1. Collect apparatus

2. Cut out 12 potato chips with the core-pore

3. Using a ruler measure 2mm on each chip and use the scalpel to cut
it off at this point.

4. Weigh each potato chip on the scales and take note of the weight on
your table.

5. Fill each beaker with 25ml's of solution

6. Put two chips into the sucrose solution of 0.0

0.2

0.4

0.6

0.8

1.0

7. Weigh the chips on the scales after leaving them for one hour in
the solution.

8. Do it again

Test 1

Concentration (mol/litre)

Weight (g)

Weight After (g)

% Change in mass

0.0

1.51

1.71

13.25%

0.2

1.42

1.51

6.34%

0.4

1.48

1.39

-6.08%

0.6

1.47

1.25

-14.97%

0.8

1.46

1.13

-22.6%

1.0

1.53

1.19

-22.22%

Test 2

Concentration (mol/litre)

Weight (g)

Weight After (g)

% Change in mass

0.0

1.46

1.65

13.01%

0.2

1.42

1.49

4.93%

0.4

1.48

1.41

-4.73%

0.6

1.54

1.32

-14.29%

0.8

1.44

1.16

-19.44%

1.0

1.42

1.12

-21.13%

Average

Average

Concentration (mol/litre)

Average

Weight (g)

Average

Weight After (g)

Average

% Change in mass

0.0

1.485

1.68

13.13%

0.2

1.42

1.5

5.635%

0.4

1.48

1.4

-5.405%

0.6

1.505

1.285

-14.63%

0.8

1.45

1.145

-21.02%

1.0

1.475

1.155

-21.675%

Weight Change

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Concentration (mol/litre)

Conclusion

My hypothesis was correct. From this investigation I noticed that at
the start the mass of the chip increased and them it began to decrease
towards the end of the experiment.

Analysis

My hypothesis was correct. From this investigation I noticed that at
the start the mass of the chip increased and them it began to decrease
towards the end of the experiment.

My results show that the potato chips increase in mass at the start of
the investigation. When the sucrose concentration is at 0.0 the
average change in mass is 13.13% and when the concentration of the
solution is 0.2 the average change in mass is 5.635%. This suggests
that the water is moving into the chip by the process of osmosis. The
reason the mass of the chip gradually increases at the start is
because there is a high concentration of water outside the chip and a
low concentration of water within the chip. This causes the water to
enter the chip by osmosis. The chip then weighs more after removal.

At concentrations above 0.4 the chip begins to decrease in mass, e.g.
when the concentration is at 0.4 the average change in mass drops to
-5.405%. This suggests that the water is moving out of the chip by the
process of osmosis. The chip then begins to decrease in mass because
the sucrose solution has a lower concentration on water and the chip
had a higher concentration of water. This causes the chip to decrease
in mass as the water leaves the chip by osmosis. The chip then weighed
less after removal.

Evaluation

The graph that shows the average weight strongly resembles my
prediction. This suggests that the experiment is fairly accurate.

The investigation could have been made more reliable by repeating the
experiment more than twice.

The surface area of the potato chips were not all the same, the
results would have been more reliable if they were all the same mass
to begin with. This would have made it a fair test, as the sucrose
concentration would have had the same surface area to react upon.

To provide additional evidence I could have included concentrations
that increased by 0.1, this would have also increased the accuracy of
my results. I could have also used different types of potatoes and
sizes.

Safety

· Make sure all bags are under desks so no one is liable to trip or
fall.

· Walk slowly as you may trip or collide with another person

· Be sure to hold scalpel appropriately as injury could occur.

· Be careful not to spill solution onto floor as someone may slip. If
you do happen to spill the solution, be sure to clean it up
immediately.

· Make sure you follow all the instructions of your teacher.

· Make sure all apparatus is put away in their proper place.

· Do not carry to many pieces of apparatus at once.



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