To investigate the effect of varying concentrations of a certain sugar solutions on the amount of osmotic activity between the solution and a potato chip of a given size.

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Jamie Noke   10ANS   Biology Coursework (Osmosis) Mr Sheridan 10S

Osmosis Assessment

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. This basically means water diffuses from where it’s in a high concentration to where’s it’s in a low concentration.

Aim:   To investigate the effect of varying concentrations of a certain sugar solutions on the amount of osmotic activity between the solution and a potato chip of a given size.

Plan:   I plan to find out by using cut potatoes in the shape of chips to study osmosis, by seeing how different concentrated and a pure water solution will effect the chip. I will study water moving from a high concentration, to a low concentration along a concentration gradient.

Fair Test:  During the experiment I will keep the experiment fair by making sure each chip is the same length (6cm), and that I put the same amount of solution in each Measuring Cylinder.

Safety: Before the experiment I will make sure that the desktops are not wet so no measuring cylinders will fall off. Also during the experiment I will wear safety glasses to protect my eyes in case solution gets in them. While using the potato cutter I will make sure my fingers are as far away as possible from it so there is no risk in me cutting them.

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Prediction:  I predict that when a chip is placed in the pure water and left, water will enter it by osmosis this making it way more on its removal. But when a chip is placed in a sugar solution and left, on its removal it will weigh less. The more sugar used in each sugar solution, the lighter the chip will be when it is removed.

Hypothesis:  I think that what I have said it my prediction is what will happen during the experiment because the pure water will allow the chip to absorb it by osmosis whereas ...

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