Property data for 38 wt% aqueous solution of HCl. Hydrochloric acid, also known as muriatic acid, is a colorless to yellow liquid, with a pungent odor. Hydrochloric acid is a strong acid used as chemical reagent, pH-regulating, ion exchanger regenerating, pickling or cleaning agent. EINECS: 231-595-7/CAS: 7647-01-0/UN: 1789 Information provided by Solvay |