Question

The formation of hydrochloric acid when chlorine is added to water.

Answer 1

H2O + Cl2 - - - - - > HCL + HOCl

Answer 2

When chlorine gas (Cl2) is added to the water (H2O), it hydrolyzes rapidly to produce hypochlorous acid (HOCl) and the hypochlorous acid will then dissociate into hypochlorite ions (OCl-) and hydrogen ions (H+). Because hydrogen ions are produced, the water will become more acidic (the pH of the water will decrease).