What Is the Value of the Equilibrium Constant for the Following

Essay

What is the value of the equilibrium constant for the following equilibrium? $\mathrm{HC} \equiv \mathrm{CH}+\mathrm{NaNH}_{2}\rightleftharpoons$$\mathrm{HC} \equiv \mathrm{C}_{:}^{-} \mathrm{Na}^{+}+\mathrm{NH}_{3}$
$p K_{\mathrm{a}}=25$ $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$p K_{a}=38$