# What is the conjugate acid of HSO_4^-1?

The conjugate acid of bisulfate ion, $H S {O}_{4}^{-}$, is ${H}_{2} S {O}_{4}$.
The conjugate acid of any base is the base PLUS a ${H}^{+}$. As in any chemical reaction, charge AND mass are conserved.
What is the CONJUGATE BASE of $H S {O}_{4}^{-}$?