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An Investigation into Potato Tissue
Member rating: No Rating | Words: | Submitted: Fri Mar 31 2006
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An Investigation into Potato Tissue Aim: To investigate how varying the sucrose concentration around piece of potato tissue affects the diffusion of water (osmosis) into or out of the cell. Introduction: Definition of Osmosis: This is the diffusion of water molecules from an area of high water concentration (dilute solution) to an area of low water concentration (concentrated solution) through a permeable membrane. The rate, again, depends on the surface area, the concentration gradient and the properties of the partially permeable membrane. A diagram of Osmosis: We have looked into osmosis previously in the experiment of turgid and plasmolysed onion cells, and a visking tube. Demonstration of Osmosis Using a Visking Experiment The Visking tube experiment was used to demonstrate osmosis. The Visking tubing was semi-permeable, which allows small molecules (water) to pass through, but it doesn't allow the larger ones (sugar). Apparatus * a small length of capillary tubing * a larger amount of Visking tubing * 0.5 sucrose...
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