This lab was to theorize the relationship between solute concentration and the movement of water through a selectively permeable membrane by the process of osmosis. The materials used within this lab were sucrose, distilled water, dialysis tubes and six beakers. Each tube was filled with a certain amount of sucrose ranging from .2 to 1.0 M and then placed into a beaker filled with about 166 mL of distilled water. Note that the tubes are to be set for a time limit (30 minutes) in the beaker to get a more sufficient result. To determine the change in concentration, the tubes were measured (mass) before and after to conclude the change of the molarity for sucrose to the water potential of the distilled water. Through this procedure, the results and the process helped to under what osmosis does in aiding the cell.
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. Diffusion results because of the random movement of particles. The diffusion of water into and out of a selectively permeable membrane is called osmosis. Because of the selectively permeable membrane, nothing but water and other very small particles can be diffused through osmosis. T
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The possible errors could be do to measure, time, and interferences. There could be an unequal amount of each solution in the bag. To fix this problem, you should use the graduated cylinder and fill to exactly 15 mL. How time can be affected is if you take the tubes out too early or too late. Another problem in time could be if you forgot to time the tube has been in the beaker. In this case, the directions should have been read careful or asked by the instructor. As for the interferences, there should be a certain way that each object is handled. For example, the dialysis should be gently held otherwise it can break.
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