Question

Autoprotolysis constant of $N{H}_3$ is

• A. $\left[N{H}_4^{+}\right]\left[N{H}_3\right]$
• B. $\left[N{H}_2^{-}\right]\left[N{H}_3\right]$
• C. $\left[N{H}_4^{+}\right]\left[N{H}_2^{-}\right]$
• D. $\frac{\left[N{H}_4^{+}\right]}{\left[N{H}_2^{-}\right]}$

Answer 1

The correct option is C $\left[N{H}_4^{+}\right]\left[N{H}_2^{-}\right]$

Autoprotolysis of $N{H}_3$ takes place as:
$2N{H}_3\rightleftharpoons N{H}_4^{+}+N{H}_2^{-}$
$\therefore$ Autoprotolysis constant $=\left[N{H}_4^{+}\right]\left[N{H}_2^{-}\right]$