Question

Define the term osmotic pressure . describe how the molecular mass of substance can be determined by a method based on measurement of osmotic pressure.?​

Answer 1

Explanation:

osmotic pressure is proportional to the molarity, C of the solution at a given temperature T. Thus: Π = C R T. Here Π is the osmotic pressure and R is the gas constant.

Answer 2

Explanation:

The minimum pressure which should be applied on the solution , so as to prevent the movement of the solvent molecules into the solution from solvent side through a semipermeable membrane is called osmotic pressure.

Molecular mass by osmotic pressure method

:- the osmotic pressure (π) of a solution is given by

πv = nRT

where , v is volume of the solution.

n is no. of moles of the solute.

T is temporarily on the Kelvin scale

if w is the mass of solute of molar mass M then

n = w/M

πV = w/MRT

M = wRT/πV

thus knowing w, R ,T,π and V one can obtain M the molar mass of the solute.

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