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14 years ago
Why does the concentration of a solute cause the movement of water through osmosis?

Water is unusual in that it can cross a non-polar membrane but also react and form solutions with ions and polar molecules that cannot cross the same membrane. When water molecules react with a solute they are no longer free to cross the membrane. The more solute, the fewer molecules left that are free to diffuse across the membrane. Therefore a highly concentrated solution (one with lots of solute) has a low effective concentration of water. Therefore water will tend to diffuse across a membrane from areas of low solute concentration to areas of high solute concentration – until the concentration of the solution is equal on both sides. This is only true if the solute cannot cross the membrane.

<a rel="nofollow" href="https://http://glencoe.mcgraw-hill.com/sites/dl/free/9834092339/291136/Osmosis.swf" target="_blank">https://http://glencoe.mcgraw-hill.com/sites/dl/free/9834092339/291136/Osmosis.swf</a>
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