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Calculate the acidity constant of hypochlorous acid

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Reference no: EM13838429

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-        Ka = {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?

Reference no: EM13838429

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