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Investigating Osmosis Aim: Investigating the effect of water concentration on the mass of potato tissue. Scientific Theory: Osmosis is defined as the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. In a high concentration of water the amount of solute (e.g. sugar) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute (e.g. sucrose) is high. This could be called a strong or concentrated solution. When two such solutions are divided by a partially permeable membrane the water will move from the area of high concentration to the area of low concentration, until both sides are equal (have reached equilibrium). Knowing that osmosis will occur across a partially permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane, and knowing that...

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