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Yes. Chlorine gas reacts with water to give hypochlorous acid and hydrochloric acid

Cl2 + H2O -> HOCl + HCl

The hypochlorous acid is the "disinfectant" most effective at pH 5, at low pH it forms hypochlorite ions.

Remember if the water is impure the chlorine can potentially react with the impurities.

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Q: Does chlorine gas react with cold water?
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