Starting with an aqueous solution of 75mL of 0.35M NaOCl (kb= 2.8x10^-7) determine the observed pH of the solution at the following points in a titration:
a. at the beginning
b. after the addition of 10mL of .20M HCl
C. at the equivalence point
D. after the addition of 165mL of .20M HCl