Consider the titration of 40.0ml of 0.200M HONH2 (Kb=1.1 x 10-3) by 0.100 M HNO2. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added:
a) 0.0ml
b) at half the volume needed to reach the endpoint
c) at the volume needed to reach the endpoint
d) 110.0ml