# Question #d12c9

Apr 27, 2017

Conjugates are particles that differ by one ${H}^{+}$ ion. The acid has an "extra" that the base lacks.

#### Explanation:

So, in a) $N {H}_{4}^{+}$ (acid) and $N {H}_{3}$ (base) are conjugates. Same for $H C N$ (acid) and $C {N}^{-}$ (base).

b) $H C {O}_{3}^{-}$ (acid) and $C {O}_{3}^{2 -}$ (base) are conjugates, as are HCl (acid) and $C {l}^{-}$ (base).

In the second question, for the substance to be an acid (only), it must have a ${H}^{+}$ it can donate to ${H}_{2} O$, but must not acquire a ${H}^{+}$. This includes ${H}_{2} S {O}_{4}$ as the only chemical that is only an acid.

$C {H}_{3} C O {O}^{-}$ and $S {O}_{4}^{2 -}$ are only bases (the H atoms bonded to the C do not ionize).

All the rest can serve as either acid or base.