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Sarah Carr Biology Coursework 2001 Investigation to work out the concentration in potato cell sap Preliminary work As an introduction to osmosis, an experiment was carried out with a model cell. The model cell experiment shown how osmosis occurs, demonstrated with two cells - Cell A Cell B Water diffuses into 'cell' Water diffuses out of 'cell' Visking Visking Tubing Tubing (Partially (Partially Permeable Permeable Membrane) Membrane) Cell A was filled with sugar solution, cell B was filled with water, and then the two cells were weighed. Cell A was placed into a beaker of water and cell B was placed into a beaker of sugar solution. They were both left for 30 minutes, and then the cells were weighed again. It was discovered that cell A (containing sugar solution), increased in weight. This was because water was allowed to pass into the cell and into the strong solution by osmosis. Therefore cell B, decreased in...

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