## Chemistry: The Central Science (13th Edition)

$HF$ is a weak acid. Conjugate base: $F^-$, which is a weak base.
$HF(aq) + H_2O(l) --> F^-(aq) + H_3O^+(aq)$ As we can see in this reaction, $F^-$ is the conjugate base of $HF$. Since $HF$ is a weak acid, $F^{-}$ will be a weak base.