A 25.00 mL sample of 0.100 M KHP is titrated with 0.100 M NaOH. What is the pH of the solution at the following points in the titration? Ka, KHP = 3.9 x 10^-6
(a) At the beginning of the titration when no NaOH has been added yet
(b) When 12.5 mL of NaOH has been added
(c) At the end point (or equivalence point) of the titration
(d) When 30.0 mL if NaOH has been added