Acid salt

Acid salt is a term in chemistry that refers to a salt from which hydrogen of an acid is not completely removed. This salt is obtained by the partial neutralization of diprotic or polyprotic acids. Since the parent acid is only partially neutralized, one or more replaceable hydrogen atoms remain.

For example - Potassium hydrogen sulfate. Chemical formula of this salt is KHSO₄. Here we can see the presence of H, which has not been completely removed.