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From this I can see the change in mass(g) and so work out the amount of water that has moved and the rate of the osmosis in a set time. This can then be used to see how the concentration affects osmosis. I
Control Variables.
The control variables are the set of factors that must be kept the same for every test to make sure that the results are reliable. The first controlled variable is the type of potato. This is because it may have more or less water than another type as well as a different selective membrane and so the results may be altered because of this. If the potato has more water, for example, the weight of the potato might go up with one type whilst go down with another even if it was in the same solution; therefore the potato type must be controlled throughout the tests...
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