Which pa of chlorine disinfection is most effective?-
The disinfecting action of chlorine is mainly due to hypochlorous acid. It is 70-80 times effective than hypochlorite ion. So chlorine acts as best disinfectant a when pH of water is around 7 because of the predominance of hypochlorous acid. (PARK TB 25th edition pg 774)
Hypochlorous acid
Hypochlorous ion
Hypochlorite ion
None
Environment and health