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Colligative Properties and Determination of Molar Mass - Osmosis and Osmotic Pressure

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Estimated time: 4 minutes
CBSE: Class 12
Maharashtra State Board: Class 12

Definition: Semipermeable Membrane

It is a thin film, such as cellophane, which has pores large enough to allow the solvent molecules to pass through them.

or

When a solution and pure solvent or two solutions of different concentrations are separated by a semipermeable membrane, the solvent molecules pass through the membrane this is called osmosis.

CBSE: Class 12
Maharashtra State Board: Class 12

Definition: Osmosis

It is the net spontaneous flow of solvent molecules into the solution or from a more dilute solution to a more concentrated solution through a semipermeable membrane.

CBSE: Class 12
Maharashtra State Board: Class 12

Definition: Reverse Osmosis

If a pressure larger than the osmotic pressure is applied to the solution side, then pure solvent from the solution passes into the pure solvent side through the semipermeable membrane. This phenomenon is called reverse osmosis.

or

Osmosis is a flow of solvent through a semipermeable membrane into the solution. The direction of osmosis can be reversed by applying a pressure larger than the osmotic pressure. This is called reverse osmosis.

CBSE: Class 12

Definition: Osmotic Pressure

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.

\[\pi=\frac{n_2RT}{V}=\mathrm{CRT}\]

\[\pi=\frac{w_2RT}{\mathrm{M}_2V}\]

Shaalaa.com | Solutions part 28 (Colligative Properties :- Osmosis and Osmotic Pressure)

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Solutions part 28 (Colligative Properties :- Osmosis and Osmotic Pressure) [00:18:10]
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