A 50 mL solution containing 0.10 M 1-Naphtoic acid (pKa = 3.70) and 0.15 M arsenic acid (pKa1 = 2.24; pKa2 = 6.96) is titrated with 0.20 M KOH.
(a) How many end points will be observed?
(b) What is the pH of the solution before adding any KOH?
(c) Calculate the volume of KOH required to reach the first equivalence point.
(d) Calculate pH after the addition of 100 mL of KOH (suppose that OH-contribution from water autoprotolysis is negligible).