Question

How molar mass of a solute is determined from osmotic pressure measurements?

Answer 1

Osmotic pressure symbol= $\pi$

$\pi \propto C$ [Molarity]

$\pi \propto T$

$\therefore \pi =STC$ where $S$= solution constant

$\because$ Molarity= $\frac{\text{Moles}}{\text{(V) Volume in litres}}$ and moles= $\frac{\text{weight(W)}}{\text{Molar mass(m)}}$

$\therefore \pi =\frac{W}{m}\times \frac{1}{V}\times S.T⟶$ From this equation molar mass can be determined.