• question_answer Write down the conjugate acid and conjugate base of (i) ${{H}_{2}}O$                              (ii) $HSO_{4}^{-}$ (iii) $N{{H}_{3}}$                            (iv) $H{{S}^{-}}$

(i) ${{H}_{3}}{{O}^{+}},\,O{{H}^{-}}$                     (ii) ${{H}_{2}}S{{O}_{4}},\,SO_{4}^{2-}$                 (iii) $NH_{4}^{+},\,NH_{2}^{-}$                                     (iv) ${{H}_{2}}S,\,{{S}^{2-}}$ Note. To write the conjugate acid of the given species, add ${{H}^{+}}$ ion. To write the conjugate base of the given species, subtract ${{H}^{+}}$ ion.