Determine the concentration of sucrose in potatoes using the principle of osmosis.

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Thursday 21st September 2006.

Determine the concentration of sucrose in potatoes using the principle of osmosis.

By Rose Bickerstaff.

Aim.

The aim of this experiment is to find the concentration of sucrose in the potato.

Prediction/hypothesis.

Osmosis is defined as the diffusion of water molecules from a high concentration to a low concentration through a semi-permeable membrane. From my preliminary trials, I believe that my graph will have roughly the same trend as the one from my preliminary results; they will just be more accurate. I think that when I do my actual experiment and I

use different concentrations of the solution; I think that the results will still follow the trend of the graph. The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium, meaning that the molecules are randomly distributed throughout an object, with no area having a higher or lower concentration than any other. When there is a high concentration of water, it is also called 'high water potential.'

Variables.

Independent: I am going to be changing the concentration of the molecular solution.

Dependant: My dependant variable is to measure the change in weight after osmosis has occurred.
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Control:

* I will keep the length of the potato the same to make sure that the test is fair, to do this I will measure the lengths and cut them all to the same length.

* I will keep the length of time that the potatoes are in the solution for (20 minutes) the same, so that all of the potatoes have the same amount of time for osmosis to take place.

* I must also use the same potato so that the test is fair.

* The cork ...

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