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Investigation Into Osmosis In Potatoes Explanation Osmosis is the movement of water through a semi-permeable membrane from any area of high water concentration to one of lower concentration. This diagram shows this: The larger solute (sugar) molecules cannot get through the semi-permeable membrane, but the smaller solvent (water) molecules can get through. This diagram shows this: The water molecules can pass both ways through the membrane, but because there are more on one side than on the other there is a steady flow in to the side with fewer water molecules and more sugar molecules. They go through until the concentration of water is equal - there is an equilibrium. You can also look at the water potential of the solution to determine whether it is likely to lose or gain water molecules from the other solution. Water flows from a high potential to a low potential. A solution which has a high...

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