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... a simple expression. On the right side there is pure water, which has the maximum water potential of 0. Water potential is the pressure created by water. As you can see from the diagram the pure water is pushing its way through the semi permeable membrane at a high pressure. This is its water potential. Water potential is measured in kilopascals (kPa) and is represented by the letter ?. Prediction I predict that the lower the concentration of salt solution the higher the water potential will be and therefore the higher the % change in mass will be, I predict this because osmosis is the diffusion of water molecules from a region where it has higher water potential to a region where it has lower water potential through a partially permeable membrane5. Therefore the distilled water will have the highest water potential and the 1.0 mole of salt solution will ...