# Are sulfates soluble?

Well, $S {O}_{4}^{2 -}$ is a common anion.........
$\text{Sulfates}$ and $\text{bisulfates}$ are salts of $S {O}_{4}^{2 -}$ and $H S {O}_{4}^{-}$ (i.e. ${\left(O =\right)}_{2} S \left(O H\right) {O}^{-}$; reasonably the charge is presumed to ride on the oxygen). The parent acids are of course ${H}_{2} S {O}_{4}$ and $H S {O}_{4}^{-}$.
Metal sulfates tend to be soluble in aqueous media; there are a few exceptions, i.e. notably with metallic dications, ${M}^{2 +}$.