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Define osmotic pressure. Prove that osmotic pressure is a molecular property. |
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Answer» Osmotic pressure:- The excess pressure is exerted on the surface of solution to just prevent osmosis is called osmotic pressure. It depends upon the molal concentration. Hence it is a colligative property. According to Van't Hoff π ∝ C (at constant temp.) and π ∝ T (At constant Concentration) Both laws are combined, we have π ∝ CT and c = n/v; π = RCT; π = n/v RT or, πv = nRT or, π = W/M RT Where M = molecular weight and R = Gas constant. |
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