Question

what is osmotic pressure how does it depend on temp. and atmospheric pressure ?

Answer 1

Osmotic pressure is driven by the tendency of the solute molecules that are not glueing together to take up as much space as they can get. This is the same as for molecules in the gas phase, and described by the ideal gas law: pV=nRT.

Answer 2

HEY MATE HERE IS YOUR ANSWER:-

The minimum excess pressure which must be applied over the solution to just prevent the penetration of pure solvent into the solution through a semipermeable membrane is known as osmotic pressure.

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