Define osmotic pressure. Prove that osmotic pressure is a colligative

1.	Define osmotic pressure. Prove that osmotic pressure is a colligative property.
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

Define osmotic pressure. Prove that osmotic pressure is a colligative property.

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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Define osmotic pressure. Prove that osmotic pressure is a colligative property.

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