Osmosis

In my experiment, I plan to find out whether the concentration of sugar in water
affects how much water will go in to a potato chip. I will do this by having
twelve test tubes three with one molar of sugar solution, three with ½ molar
sugar solution, three with ¼ molar sugar solution and three with zero molar
sugar solution. I will do three of each so I can take an average from the
results. Prediction For the investigation I think that the lower the
concentration of sugar in the test tube the larger mass the potato chip will be.

I think this because I know that Osmosis is the movement of water molecules
across a partially permeable membrane from an area of high water concentration
to an area of low water concentration. Therefore the water molecules pass from a
high concentration (in the water itself) to a low concentration (in the potato
chip). Therefore, the chips in higher water concentrations will have a larger
mass than in higher sugar concentrations. Diagram For Prediction This is a
diagram for what I predict will happen in the experiment. If the potato is in
one Molar solution then the increase in mass due to osmosis will be little, as
there is more sugar than water in the solution. If it is in 0.5 Molar solution,
it should increase a little. If it is in pure water then the increase will be
quite a lot, as there are many water molecules in water, therefore due to
osmosis its mass will increase more that the other two experiments. Fair Test In
the investigation, I will make it a fair test by keeping the following things
the same: 1. Volume of solution – 20ml 2. Same size boiling tube 3. Same type
of potato 4. Temperature – Room Temperature 5. Same sugar solution 6. Same
size potato borer 7. Time left for – 48hrs 8. Size of potato chip – 20mm For
all of these criteria, having them not uniform in all of the tests would mean it
would not be a fair test. For instance if I had a longer potato the surface area
would be bigger and there would be more space for osmosis to occur. Apparatus To
do this test I will need – 1. Twelve test tubes 2. Sugar solution 3. Water 4.

Twelve potato chips 5. Size 5 borer 6. Ruler 7. Two test tube racks 8. A Knife

Diagram These are diagrams of how the apparatus is used. This first one is about
boring the holes in the potato This one is the potato chip in the water
solution. Method 1. Take about two or three potatoes and bore twelve potato
cylinders out of them using borer size 5. 2. Cut the potato cylinders to 20mm,
then set aside. 3. Collect twelve test tubes and put in test tube racks. 4.

Measure 20, 10 and 15ml of water three times (3 x 20, 3 x 10 and 3 x 15ml water)
then 5. Measure 20, 10 and 5ml of sugar solution three times (3 x 20 3 x 10 and

3 x 5ml sugar solution) 6. Mix these in this order, 20ml water in three test
tubes. Three test tubes of 10ml water + 10ml sugar solution. Three test tubes of

15ml water and 5ml sugar solution. Finally three test tubes of 20ml sugar
solution. 7. Attempt to put all potato chips in at the same time. 8. Leave for

48hrs. 9. Come back in 48hrs time and take all the potato chips out of the test
tubes. 10. Roll them carefully on paper towels or other absorbent material to
remove excess water. 11. Weigh each chip individually and record the
measurement. Results Molar Mass at start Mass at finish Difference Increase in %

1.00 1.68 1.22 -0.46 -27.38 0.50 1.68 1.36 -0.32 -19.05 0.00 1.68 2.20 0.52

30.95 1.00 1.68 1.22 -0.46 -27.38 0.50 1.68 1.38 -0.30 -17.86 0.00 1.68 1.95

0.27 16.07 1.00 1.68 1.21 -0.47 -27.98 0.50 1.68 1.33 -0.35 -20.83 0.00 1.68

1.90 0.22 13.10 Graphs See attached sheets. Conclusion My results show that the
mass of the potato in the experiment with one molar of sugar solution decreased
by about -27.68 % which means Osmosis must have occurred because the water
leaving the potato’s cells into the sugar solution decreased the mass as the
sugar molecules can’t get into the potato as its molecules are too big. The
potato that was in 0.5 molar sugar solution decreased in mass by -19.25%.

Looking at the graphs you will