Question

The degree of ionization $\left(\right.\alpha \left.\right)$ of a weak electrolyte $A_{x}B_{y}$ is related to van't Hoff factor by expression

• A. $\alpha =\frac{i - 1}{x + y + 1}$
• B. $\alpha =\frac{i - 1}{x + y - 1}$
• C. $\alpha =\frac{x + y - 1}{i - 1}$
• D. $\alpha =\frac{x + y + 1}{i - 1}$

Answer 1

Answer: (B)

$\alpha =\frac{i - 1}{n - 1}$
Here, n = number of ions formed = x + y
So $\alpha =\frac{i - 1}{x + y - 1}$ .