Question

NaOCl is added to drinking water to obtain a concentration of 10-mg/L. Prepare a graph (using MS-Excel or comparable program) showing the concentration of hypochlorous acid and hypochlorite ion for a pH range of 5.0 to 9.0. Indicate the pKa on the graph and determine the concentration of the two chlorine species at this value.

Answer 1

ANSWER:

At pH = 5

At pH = 6

At pH = 7

At pKa = 7.49

At pH = 8

At pH = 9

See the Graph: