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An Investigation into the factors affecting osmosis. Problem. In this investigation I am trying to find the effect of placing potatoes cut into French fries into salt solutions of different concentrations and the subsequent percentage difference in weight between potatoes placed in different salt concentrations. Hypothesis. Osmosis is the transfer of water from a region of high water concentration through a selectively-permeable membrane to a region of low water concentration. A selectively-permeable membrane will let through small molecules such as oxygen, water and glucose but will not allow larger molecules such as starch or protein. This can be seen in the diagram below: If a selectively-permeable membrane, such as a potatoes membrane, separates a solution of high water concentration(a hypotonic solution) from a solution of low water concentration(a hypertonic solution), the water will move in both directions at one time. However, more water will leave the solution of high water concentration than leaves the solution...

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