Osmosis Investigation

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Osmosis Investigation Introduction For my Biology coursework I am investigating osmosis. I am doing a practical to find out how osmosis affects one of the variables listed below. Variables * Temperature * Concentration of sucrose solution * Time in solution * Beginning mass of chip * Amount of distilled water with the sucrose solution * Beginning surface area of chip Idea I have chosen to test what effect the concentration of sucrose solution has on the chips. Prediction * I think that the chips in the test tubes containing more sucrose solution than distilled water will increase in temperature. * I think that the chips in the test tubes containing less sucrose solution than distilled water will decrease in mass. * I think that the chips in the test tubes containing equal amount of sucrose solution and distilled water will stay roughly the same mass. I think the graph of the results will turn out like the sketch I have drawn below. Page 1 Reason Osmosis is the passage of water molecules from a region of high water concentration, through a semi-permeable membrane to a region of low water concentration. Sucrose solution contains less water molecules (more dilute) than the chip so the water molecules will pass into the sucrose solution therefore making the mass of the chip less. Dilute water contains more water molecules (more concentrated) than the chip so the water molecules from the dilute water will pass into the chip therefore making the mass of the chip more. The more sucrose solution added to distilled water the more dilute the solution becomes. Therefore the more sucrose solution added the smaller the mass of the chip becomes. The more distilled water added the more concentrated the solution becomes.

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