(vii) Which formula co-relates degree of dissociation and co... | Chemistry - Ostwald's Dilution Law / Dissociation of Weak Electrolytes | SolveeIt

Question

(vii) Which formula co-relates degree of dissociation and concentration of electrolyte?

$c = \sqrt{\frac{K_a}{\alpha}}$

$\alpha = \sqrt{\frac{K_a}{c}}$

$c = \sqrt{K_a \alpha}$

$c = \sqrt{\frac{\alpha}{K_a}}$

Answer

$\alpha = \sqrt{\frac{K_a}{c}}$

Explanation

Solution

The degree of dissociation ( $\alpha$ ) of a weak electrolyte is related to the acid dissociation constant ( $K_a$ ) and the concentration ( $c$ ) by the formula:

$\alpha = \sqrt{\frac{K_a}{c}}$

This relationship is derived from Ostwald's Dilution Law, which simplifies under the assumption that $\alpha$ is very small compared to 1.

Question: (vii) Which formula co-relates degree of dissociation and concentration of electrolyte?...

Solution