Why HCl is called acid?

Answer 1

Because HCl react with bases, salts, oxides, metals, the solution has an acidic pH and HCl dissociate forming hydrogen ions, H+.

Answer 2

HCl is called an acid because it can donate a proton (H+) to a base, leading to the formation of hydronium ions (H3O+). Acids are substances that increase the concentration of H+ ions in a solution, resulting in the characteristic sour taste, ability to turn blue litmus paper red, and to react with bases to form salts and water.