(Answered) Disinfection by chlorine hoclocl- is widely used to reduce

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Disinfection by chlorine (HOCl/OCl^-) is widely used to reduce pathogens in drinking water. The ratio of HOCl/OCl^- in water is pH-dependent.

Because HOCl is a much stronger disinfectant than OCl^-, a typical goal is to achieve [HOCl] = 2 mg/L as Cl₂ (i.e., 2.82´10^-5 M of HOCl) in order to maintain sufficient disinfection efficiency.

Calculate the acidity constant of hypochlorous acid (HOCl) at 25°C, I = 0.0 M.

HOCl = H⁺ + OCl^- K_a = {H⁺}{OCl^-}/{HOCl}

Is HOCl acid dissociation endothermic or exothermic?

Suppose the source water is at 25°C, I = 0.0 M, and pH = -log{H⁺} = 7.8, how much total chlorine needs to be added to the water in order to achieve [HOCl] = 2 mg/L as Cl₂?

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