Answer
(a) $S{O_4}^{2-}$
(b) $HS{O_3}^-$
(c) $HP{O_4}^{2-}$
(d) $NH_3$
(e) $OH^-$
(f) $N{H_2}^-$
Work Step by Step
To get the conjugate base of an acid, all we need to do is: remove a $(H^+)$ from the acid:
1. Remove one hydrogen from the formula:
Ex: $NH_3 -- \gt NH_2$
2. Subtract 1 from the charge:
Ex: $NH_2 -- \gt N{H_2}^-$
