Textbook Problem

Calculate the value for the equilibrium constant for each of the following aqueous reactions.

a. ${\text{NH}}_{\text{3}}{\text{+H}}_{\text{3}}{\text{O}}^{\text{+}}\rightleftharpoons {\text{NH}}_{\text{4}}{}^{\text{+}}{\text{+H}}_{\text{2}}\text{O}$

b. ${\text{NO}}_2{}^{-}+{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\rightleftharpoons {\text{HNO}}_{\text{2}}+{\text{H}}_{\text{2}}\text{O}$

c. ${\text{NH}}_{\text{4}}{}^{\text{+}}+{\text{OH}}^{-}\rightleftharpoons {\text{NH}}_{\text{3}}+{\text{H}}_{\text{2}}\text{O}$

d. ${\text{HNO}}_2+{\text{OH}}^{-}\rightleftharpoons {\text{H}}_{\text{2}}{\text{O+NO}}_2{}^{-}$