Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added.
(a) 0.0 mL
(b) 20.0 mL
(c) 25.0 mL
(d) 40.0 mL
(e) 50.0 mL
(f) 100.0 mL