Answer
$H^{+} (aq) + F^{-} (aq)$ $HF (aq)$
Work Step by Step
1. Try to identify a base in the salt:
In this case, $F^{-}$ is a strong base, as it is the conjugate base of a weak acid, $HF$. Since $F^{-}$ is a strong base, when there is an abundant amount of $H^{+}$ in the solution from the strong acid, the protonation of $HF$ would occur.
2. Write a net ionic equation:
$H^{+}$, an acid, would react with $F^{-}$, a base.
$H^{+} (aq) + F^{-} (aq)$ $HF (aq)$
