Osmosis Lab Report

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The net movement of water through a semi permeable membrane and its dependency upon the concentration of solutes in a solution. Abstract: Osmosis is a process by which water molecules travel between a semi permeable membrane in order to equalize solute concentration on both sides of the membrane. This experiment was performed in order to show how the concentration and tonicity of the solute/ solution combination affects the net water movement between the cell and its environment. The results obtained show that if a cell is placed into a solution with a more concentrated solute the cells will shrivel and shrink as shown by the hypertonic reaction that occurred when dialysis tubing with 10 mL of dH2O was submerged into a 40% sucrose solution.…show more content…
The experiment conducted showed a gradual flow of water between two solutions divided only by a semi permeable membrane; this is the process of osmosis. The net movement of water in any case depends on the concentration gradient of solute versus solvent ratio; solute being the substance being dissolved and solvent being the substance doing the dissolving, when talking about osmosis the solvent will always be an aqueous solution. In order to measure the movement of water between a membrane and its environment biologists refer to the tonicity or the concentration of solutes that cannot cross the plasma membrane relative to the concentration of solutes inside the membrane. When studying two solutions of unequal solute concentration, a student can use relative terms such as hypertonic, hypotonic, and isotonic to determine the net movement of the solvent. The term hypertonic refers to a solution that contains a higher concentration of solutes; while hypotonic refers to a solution with a lower concentration of solutes. An isotonic solution is described a solution that has no net movement of water because the solute concentrations are equal. In many cases when biologist study tonicity examples of animal red blood cells are used, in cases like this tonicity refers to the environment the cell is in, not the concentration inside the cell. Logically speaking, if…show more content…
Bags 1, 2 and 3 were filled with solutions of 0%, 20% and 40% sucrose then placed in beakers of distilled water (see lab manual page 104 for exact instructions and materials), at every 15 minuet interval the bags were taken out and weighed again and a change in mass was calculated. Using the calculations of mass the rate of osmosis was determined using the formula: Slope (rate of osmosis) = (Mass at time f) – (Mass at time i) Time

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