Question

If $\alpha$ is the degree of ionization, $C$ the concentration of a weak electrolyte and $K _ { a }$the acid ionization constant, then the correct relationship between $\alpha , C$ and $K _ { a }$is.

• A. $\alpha ^ { 2 } = \sqrt { \frac { K _ { a } } { C } }$
• B. $\alpha ^ { 2 } = \sqrt { \frac { C } { K _ { a } } }$
• C. $\alpha = \sqrt { \frac { K _ { a } } { C } }$
• D. $\alpha = \sqrt { \frac { C } { K _ { a } } }$

Answer 1

Answer: (C)

$\alpha = \sqrt { \frac { K _ { a } } { C } }$

Answer 2

According to the Ostwald’s dilution formula $( 1 - \alpha )$ can be neglected. So that $\alpha = \sqrt { \frac { K _ { a } } { C } }$.