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The amount of hypochlorous acid formed when pH of water is 8 is _______________

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in Environmental Engineering by (81.4k points)
The amount of hypochlorous acid formed when pH of water is 8 is _______________

(a) 95% of total free chlorine

(b) 80% of total free chlorine

(c) 30% of total free chlorine

(d) 5% of total free chlorine

I got this question in semester exam.

My doubt stems from Factors Affecting Chlorination topic in chapter Properties of Disinfection of Environmental Engineering

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Best answer
Right option is (c) 30% of total free chlorine

The best I can explain: When chlorine is added to water, the amount of hypocholorous acid decreases as pH of water increases. It is 95% of total free chlorine when pH < 6.7 and 30% of total free chlorine when pH of water is 8.

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