Chemistry - Ionic Equilibrium Question with Solution | TestHub

Here$\mathrm{C}{\mathrm{O}}_3^{2-}$and${\mathrm{H}}_2\mathrm{O}$are Bronsted bases as water accept${\mathrm{H}}^{+}$and$\mathrm{C}{\mathrm{O}}_3^{2-}$is the conjugate base of$\mathrm{H}\mathrm{C}{\mathrm{O}}_3^{-}$and as the reaction is reversible so$\mathrm{C}{\mathrm{O}}_3^{2-}$is accepting${\mathrm{H}}^{+}$also.
$\mathrm{H}\mathrm{C}{\mathrm{O}}_3^{-}+{\mathrm{H}}_2\mathrm{O}\rightleftharpoons \mathrm{C}{\mathrm{O}}_3^{2-}+{\mathrm{H}}_3{\mathrm{O}}^{+}$