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Natalie Cook Lab 1 AP Biology 21 September 2007Title- Diffusion and OsmosisObjectives- To observe the processes of diffusion and osmosis in a model membrane system; to investigate the effect of solute concentration on water potential as it relates to living plant tissuesHypothesis- I hypothesize that a more noticeable change in color will indicate an increased presence of glucose, which I predict will increase the mass of the solutions.Materials- distilled water, 250mL beaker, dialysis tubes, glucose solution, .2 M sucrose, .4 M sucrose, .6 M sucrose, .8 M sucrose, 1.0 M sucrose, potato slicesProcedure A1.Obtain pieces of presoaked dialysis tubing, and tie off one end of each to form bags2.Test the 15% glucose/ 1% starch solution for the presence of glucose3.Place 15mL of the 15% glucose/ 1% starch solution in the bag. Tie off the free end of the bag, leaving adequate space for eventual expansion of the bag’s contents. 4.Fill beaker 2/3 fill with distilled water, add about 4mL of Lugol’s solution to the distilled water and record the color of the water5.Immerse the bag in the beaker of solution6.Allow experiment to stand for 30mins and record the final color of the bag’s solution7.Test the liquid in the beaker and in the bag for the presence of glucose.Data Observations TableInitialSolution Color Presence of Glucose