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2.2 (a) During drinking water treatment, assume

that 17 lb of chlorine are added daily to disinfect 5 mil-

lion gallons of water. What is the aqueous concentra-

tion of chlorine in mg/L? (b) The chlorine demand is the

concentration of chlorine used during disinfection.

The chlorine residual is the concentration of chlorine

that remains after treatment so the water maintains

its disinfecting power in the distribution system. If

the chlorine residual is 0.20 mg/L, what is the chlorine

demand in mg/L?