Biology Osmosis Report

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. Design a) Defining the problem and selecting Variable I) Aim/Research Question: To investigate the effect of solute concentration on the length of potato strips when submerged in a range of concentrations of sugar solution. II) Hypothesis: If the concentration of the sugar solution increases, then the osmotic gain of the potato strip will decrease. III) Scientific Explanation: Osmosis is a type of passive transport where passive movement of water molecules occurs along a concentration gradient, across a partially permeable membrane. (Damon, )Since the movements of substances in passive transport take place from an area of high concentration to an area of lower concentration until both areas reach equilibrium, the water molecules will move from the potato strips to the sugar solution when there is less water concentration in the solution. Therefore, this means that as the sugar solution concentration increases, there will be more sugar molecules in the solution and less water molecules, therefore lowering the water concentration in the solution, causing the water molecules from the potato strips to move from the higher concentration area to the sugar solution with lower concentration. Vise versa, when there is lower concentration of sugar solution, there will be an increase of water concentration in the solution, therefore water molecules will move from the solution to the potato strips where there will be a relatively lower water concentration. IV) Variables: Independent- concentration of sugar solution (mol per dm³) Dependent- change in length of potato strip (cm) Control- initial length of potato strips (2cm); type of solution (sugar); type of potato b) Controlling Variables I) Independent: - The concentration of the sugar solution would be changed by using different volume of solvent to dilute the solute which would be measured by the

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