Muriatic acid has a chemical formula of HCl. Each molecule of this compound has one atom of hydrogen and one atom of chlorine. Muriatic acid is an alternate name for hydrochloric acid.
Muriatic acid is secreted by parietal cells in the digestive system. The acid is used to digest food in the stomach, which has a protective lining that prevents acidic substances from damaging the delicate tissues. This acid also has several industrial applications. Muriatic acid is used to process leather, produce gelatin and polyvinyl chloride, purify table salt, pickle steel and dissolve rock during the process of oil production. If diluted properly, muriatic acid is also used as a household cleaner.