Answer
(a) Acids: $HF$ and $H_3O^+$; Bases: $F^-$ and $H_2O$.
(b) Acids: $H{SO_4}^{2-}$ and $N{H_4}^+$; Bases: $NH_3$ and $S{O_4}^{2-}$.
(c) Acids: $HCl$ and $CH_3COOH$; Bases: $CH_3COO^-$ and $Cl^-$.
Work Step by Step
The acids are the compounds that are donating one proton during the reaction.
The bases are the compounds that are receiving one proton during the reaction.
** Proton = $H^+$
Remember to analyze both forward (left to right) and reverse (right to left) reactions.
