Osmosis And Diffusion Lab Report

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Isra Romani Lab Report 2: Diffusion and osmosis through non-living membranes Introduction Cells contain membranes that are selectively permeable which allow certain things to pass into and leave out of the cell. The process in which molecules of a substance move from an area of high concentration to areas of low concentration is called diffusion. Whereas Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. While molecules in diffusion move down a concentration gradient, molecules during osmosis both move down a concentration. During the osmosis both move down a concentration as well as a cross it. Diffusion and osmosis are type of passive transport…show more content…
PURPOSE To provide information on the movement of water and solutes through selectively permable membranes called dialysis sacs. Materials 4 dialysis sacs ( have pores on a particular size) Small funnel 25-ml graduated cylinder Wax marking pencil Fine twine or dialysis tubing clamps 4-250ml beakers Laboratory balance Glucose solution Nacl solution Congo red dye in 40%sucrose solution Paper towel Procedure 1. Number the beakers 1 to 4 with the wax marking pencil, and half fill all of them with the distilled water except beaker 2, to which you should add 125ml of 40%glucose solution. 2. Prepare the dialysis sacs one at a time by using the funnel, half fill each with 20ml of the specified liquid. 3. Press out the air, fold over the open end of sac, and tie it securely with fine twine or clamp it before proceeding to the next sac. Rinse it under the tap, and quickly and carefully blot the sac dry by rolling it on a paper towel. 4. Weigh with a laboratory balance. Record the weight and drop the sac into the corresponding beaker. Make sure the sac is covered by beaker solution. Contents of sacs Sac 1: 40% glucose

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