# Question #64bf1

By Brønsted–Lowry acid–base theory, a species formed by the reception of a proton ${H}^{|}$ by a base is a conjugate acid . Again the species formed by leaving a proton by an acid is a conjugate base.
So to get conjugate acid from a base we are to add one proton $\left({H}^{+}\right)$ to it.
Hence by adding proton $\left({H}^{+}\right)$ to $H S {O}_{4}^{-}$ we will get the conjugate acid of the given base $H S {O}_{4}^{-}$ and it is obviously ${H}_{2} S {O}_{4}$
$H S {O}_{4}^{-} + {H}^{+} \to {H}_{2} S {O}_{4}$