Osmotic pressure and water

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Osmotic pressure and water potential

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Results / Data

We put samples of apple and potato tissue in 6 different sucrose solutions of different molarities; we measured the change in mass. We were waiting for half an hour and observing what happened with them. We put our results in a graph and a table, but they do not seem to be accurate.

Observations:

In some concentrations the apple and potato pieces were floating (between 0,6 and 0,8). That is because they lost a lot of their water – the concentrations were too concentrated for them.

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The equilibrium point (where the concentration of sucrose did not cause change of mass) for apple was approx. between 0,4 and 0,6      

concentration values. For potato

the equilibrium point was approx.

between 0,2 and 0,4 concentration values.

Where are the errors?

But our results have shown that we have done something wrong. Usually two results were accurate enough, but the third one was wrong. That may happen because we did not cut or measure the pieces right. The concentrations may also not be as they should be. The measurements also depend on types ...

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