The aim of this experiment is to investigate the volume of sucrose
solution and the weight and volume of other variables which affect
osmosis in potato cylinders. In this experiment I will weigh and blot
rings of potato and test them in different concentrations of sucrose
solution. I hope to find sufficient results as to investigate this.
In this experiment I will be investigating, and putting to test, the
theory of osmosis.
The scientific theory of osmosis is the diffusion of water through a
selectively permeable membrane into a more concentrated solution of
sucrose. Because the more concentrated solution contains a lower
concentration of water molecules, the water flows by diffusion to
dilute it until concentrations of solvent are equal on both sides of
the membrane. In simple terms, it may also be thought of as the
passage of water molecules from a low solution to a high one, across a
selectively permeable membrane. (This is shown in the diagram below).
Sugar solution Distilled water
Selectively permeable membrane
Another experiment, published by the author B.S Becket in “Biology-a
modern introduction”, gives a clear...
... middle of paper ...
...ffect the osmosis in the
potato ring. This confirms my prediction earlier that it is the
concentration of the sucrose solution not the size or weight of the
potato ring that affects osmosis.
Overall my results seemed accurate enough. They backed up and
developed my understanding of osmosis, and seemed to fit in with my
theory and scientific knowledge. I could of perhaps taken more time
over the cutting of the potato cylinders into rings, and measured my
sucrose solution as accurately as I could manage. Although I do not
think this would have affected my experiment directly, I t would have
made my results clearer and easier to interpret. Of course I could
have repeated my experiment for more accurate results, but this was
just not possible . I believe I have successfully investigated all the
factors I intended to.
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