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Osmotic pressure
Measure of the tendency of a solution to take in pure solvent by osmosis / From Wikipedia, the free encyclopedia
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Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane.[1] It is also defined as the measure of the tendency of a solution to take in its pure solvent by osmosis. Potential osmotic pressure is the maximum osmotic pressure that could develop in a solution if it were separated from its pure solvent by a semipermeable membrane
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![Progression: (1) a U-tube is filled with water and has a membrane in the middle (2) sugar is added to the left part (3) water crosses the membrane and fills the left side more than the right.](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Osmosis_diagram.svg/640px-Osmosis_diagram.svg.png)
Osmosis occurs when two solutions containing different concentrations of solute are separated by a selectively permeable membrane. Solvent molecules pass preferentially through the membrane from the low-concentration solution to the solution with higher solute concentration. The transfer of solvent molecules will continue until equilibrium is attained.[1][2]