Answer
(a) Strongest : $HF$, Weakest: $HP{O_4}^{2-}$
(b) $F^-$
(c) $HF$
(d) $HP{O_4}^{2-}$
Work Step by Step
(a)
- The strongest acid is the one with the highest $Ka$ value, and the weakest is the one with the lowest $Ka$ value.
(b)
- $F^-$ is the result of taking a proton from $HF$, therefore, $F^-$ is the conjugate base of this acid.
(c)
- The stronger the acid, the weaker is the conjugate base, therefore, $HF$, which is the strongest acid, has the weakest conjugate base.
(d)
- The weaker the acid, the stronger is the conjugate base, therefore, $HP{O_4}^{2-}$, which is the weakest acid, has the strongest conjugate base.
