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The inactivation of a pathogenic bacterium by HOCl follows Chick’s law, i.e. the rate of death...

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Civil Engineering

The inactivation of a pathogenic bacterium by HOCl followsChick’s law, i.e. the rate of death is a 1st orderreaction, where the death rate is proportional to the number ofbacteria at any time. 90 % of the pathogen are killed after 5 minfor a constant free chlorine concentration of 2 mg/L (assume lowpH, where all free chlorine is present as HOCl).

a)      (9%) Whatis the percent kill after 10 min at the same HOClconcentration?

b)     (8%) Whatpercentage of the free chlorine would be present as HOCl (notOCl-) at pH8 if the pKa for hypochlorous acidis 7.5?

c)       (3%) Whyand how would the disinfection time have to change to still achieve90 % kill of the pathogen at pH 8 at the same free chlorineconcentration? (no need to calculate, discuss in terms of order ofmagnitude)

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