Chapter 14, Problem 14.30QP

The following equilibrium constants have been determined for oxalic acid at 25°C:

$\begin{array}{l}{\text{H}}_2{\text{C}}_2{\text{O}}_4\text{(}aq\text{)}\stackrel{}{\rightleftharpoons }{\text{H}}^{+}(aq)+{\text{HC}}_2{\text{O}}_{\text{4}}^{-}(aq)\\ K{\text{'}}_{\text{c}}=6.5\times {10}^{-2}\\ {\text{HC}}_2{\text{O}}_4^{-}\text{(}aq\text{)}\stackrel{}{\rightleftharpoons }{\text{H}}^{+}(aq)+{\text{C}}_2{\text{O}}_4^{2-}(aq)\\ K{"}_{\text{c}}=6.1\times {10}^{-5}\end{array}$

Calculate the equilibrium constant for the following reaction at the same temperature:

${\text{H}}_2{\text{C}}_2{\text{O}}_4(aq)\stackrel{}{\rightleftharpoons }2{\text{H}}^{+}(aq)+{\text{C}}_2{\text{O}}_4^{2-}(aq)$