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Biology GCSE Coursework Osmosis in Potato Chips Skill Area P Planning Aim To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size Hypothesis Osmosis is defined as the net movement of water or any other solutions molecules from a region in which they are highly concentrated to a region in which they are less concentrated This movement must take place across a partially permeable membrane such as a cell wall which lets smaller molecules such as water through but does not allow bigger molecules to pass through The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium meaning that the molecules are randomly distributed throughout an object with no area having a higher or lower concentration than any other For this particular investigation I think that the lower the concentration of the sugar solution in the test tube the larger the mass of the potato will be This is because the water molecules pass from a high concentration ie In the water itself to a low concentration ie In the potato chip Therefore the chips in higher water concentrations will have a larger mass than in higher sugar concentrations The graph above shows a simple curve obtained when the concentration of the solution is plotted against the percentage change in mass At point A the graph tells the viewer that no osmosis has occurred suggesting that the concentration of water inside the cell is equal to the solution outside At point B high water concentration there is no indication that the cell is increasing further in size This is because the cell is fully turgid and no more water can enter At point C low water concentrations there is no indication
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