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             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. The cell membrane is similar to the membrane mentioned above, so the cell would lose water because of osmosis if it were placed in an environment in which water concentration is greater than that of the cell. A solution is isotonic if the concentration of dissolved substances is the same as the concentration inside the cell. Osmosis does not occur in an isotonic solution. A hypotonic solution is a solution in which the concentration of dissolved substances is lower than the concentration inside the cell. If a cell were put in a hypotonic solution, osmosis will cause water to move through the cell membrane into the cell. A solution is hypertonic if its concentration of dissolved substances is greater than the concentration inside the cell.

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