Q1: A 100.0 mL solution of 0.5 M histidine in its tribasic form,
A3- , (pKa1 = 1.70, pKa2 = 6.02, pKa3 = 9.08) is titrated with 1.0
M HCl titrant.
(a) calculate the volume of titrant required to reach the second
equivalence point,
(b) calculate the pH after the addition of 50.0 mL of
titrant,
(c) calculate the pH after the addition of 62.0 mL of
titrant,
(d) calculate the pH after the addition of 75.0 mL of
titrant.