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{NaOH}\rightleftharpoons$$\mathrm{HC} \equiv \mathrm{C:}^{-} \mathrm{Na}^{+}+\mathrm{H}_{2} \mathrm{O}$
$p K_{a}=25$ $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ $p K_{a}=15.7$