Osmosis Lab Report

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Verenice Herrera Bio 100-Sect. 017 OSMOSIS INTRODUCTION Osmosis is a type of diffusion. Diffusion is the random movement of molecules to an area of lower concentration from an area of higher concentration. In other words, osmosis is the diffusion of water. This is a diffusion where the movement of water from an area of high water concentration is moved to an area of low concentration. This experiment takes place to measure the diffusion of small molecules throughout dialysis tubing. This tubing acts as a selectively permeable membrane, allowing the larger molecules to pass through, but slowly. When the two solutions on either sides of the membrane are equal and no net movement is detected, the solutions are isotonic. This means that the solutions have the same concentration of solutes. If two solutions differ in the concentration of solutes that each has, the one with more solute is hypertonic. The solution that has less solute it is hypotonic. How do different concentrations of the source affect the rate of osmosis? If the concentration of sucrose is increased in the selective permeable bag, then the rate of the osmosis will also increase. MATERIALS AND METHODS In starting this experiment we worked in groups of four, we each filled four beakers with room temperature water. Then, got four different bags and tied one side on each end then filled them separately with different solutions that were: 0.0M, 0.25M, 0.5M, and 0.75M. After each bag was filled we made sure to take out all the excess air from the bags in which we tied the other end so the solution would not come out, allowing both sides of the bags to be tightly closed. The reason why we don’t want any leakage from the bags is so that this experiment would come out as accurate as possible. We therefore cut the excessive string, rinsing and drying each bag that had excessive solute on the outside of its

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