Yes. In chemistry, some salts make water acidic when they dissolve. Salts with cations that come from weak bases—such as ammonium chloride (NH4Cl)—release ions that react with water and produce hydronium (H3O+), so the solution’s pH drops below 7.
Other “acidic salts” keep an ionizable hydrogen after partial neutralization of a polyprotic acid (for example sodium hydrogen sulfate, NaHSO4). Not every salt is acidic: many are neutral or basic depending on their ions.