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Investigation to Determine the Water Potential of Potato Tuber Cells . AS Biology Coursework Aim: Investigate and determine the water potential of potato tuber cells. Water potential is a measure of the tendency of water molecules to pass from one place to another. The principle in this experiment is to discover a solution of known water potential, in which the tissue being examined neither gains nor loses water. Samples of the tissue are allowed to come to equilibrium in a range of solutions of different concentrations and the solution which induces neither an increase nor a decrease in mass or volume of the tissue has the same water potential as the tissue. The method is described below. Materials * Fresh potato tuber * Distilled water * 1 mol dm-3 sucrose * 6 test tubes * Test tube rack * Labels or wax pencil * 2 * 10 cm3 or 25 cm3 graduated pipettes * Tile * Scalpel or knife * 2 * 100 cm3...

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