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If bleach (NaOCl) is used to disinfect water, below what pH should the water be disinfected...

If bleach (NaOCl) is used to disinfect water, below what pH should the water be disinfected so that at least 90% of the chlorine is in the hypochlorous acid (HOCl) form? (Show equations and ALL your work for full credit).

            Note: Ka = 10 -7.6

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