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Liam Tai-Hogan Biology Coursework Osmosis Experiment Osmosis: is when a substance such as sugar dissolves in water, the sugar dissolves in water, and the sugar molecules attract some of water molecules and stop them moving freely. This, in effect, reduces the concentration of water molecules. There are more free water molecules on the left of the membrane than on the right, so water will diffuse more rapidly from left to right across the membrane than from right to left. Osmosis is water passing from a region where it is highly concentrated to a region where its concentration is lower, through a partially permeable membrane. Below is a basic diagram of Osmosis. Definitions: (from www.studentcentral.com) A Partially Permeable Membrane allows the free passage of some particles but is not freely permeable to others. Biological membranes are freely permeable to water but have restricted permeability to solutes such as glucose molecules, i.e. they are selectively permeable. Hypotonic...

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