In: Chemistry
ENVIRONMENTAL ENGINEERING - When Cl2 gas is added to water for disinfection, it hydrolyzes with water to form HOCl. The combined concentrations of HOCl and OCl- is called “free chlorine” and the pKa for HOCl is 7.5. What percentage of the total disinfection power (measured as CT OCl- ) exists in the acid form at pH = 6? At pH = 7? Which form is a stronger disinfectant?