Textbook Problem

. In each of the following chemical equations, identify the conjugate acid-base pairs.

a. ${\text{NH}}_{\text{3}}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)\rightleftharpoons {\text{NH}}_{\text{4}}{}^{+}\left(\text{aq}\right)+{\text{OH}}^{-}\left(\text{aq}\right)$

b. ${\text{PO}}_{\text{4}}{}^{3-}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\text{O}\left(\text{1}\right)\rightleftharpoons {\text{HPO}}_{\text{4}}{}^{2-}\left(\text{aq}\right)+{\text{OH}}^{-}\left(\text{aq}\right)$

c. ${\text{C}}_{\text{2}}{\text{H}}_{\text{3}}{\text{O}}_{\text{2}}{}^{-}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)\rightleftharpoons {\text{HC}}_{\text{2}}{\text{H}}_{\text{3}}{\text{O}}_{\text{2}}\left(\text{aq}\right)+{\text{OH}}^{-}\left(\text{aq}\right)$