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At what pH, chlorine in water acts as only hypochlorite ions?

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+1 vote
in Environmental Engineering by (81.4k points)
At what pH, chlorine in water acts as only hypochlorite ions?

(a) <5

(b) >5

(c) >10

(d) <3

I got this question during a job interview.

This key question is from Chlorination topic in chapter Properties of Disinfection of Environmental Engineering

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Best answer
The correct choice is (c) >10

To explain I would say: HOCl   <——>  H^+ +  HOCl^–

Where, HOCl is hypochlorous acid and  HOCl^– is hypochlorite ions.

At pH<10, only  HOCl^– is produced.

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