What causes HCl to become an acid?

Answer 1

HCI is the chemical formula for Hydrochloric acid. HCI is composed of a hydrogen ion and a chloride ion. The hydrogen ion causes HCI to become an acid.

Answer 2

HCl becomes an acid when it dissociates in water to produce hydrogen ions (H+) and chloride ions (Cl-). The presence of hydrogen ions in solution gives HCl its acidic properties, such as the ability to donate protons and lower the pH of a solution.