Quinine is a weak base, with pKb 5.10. What is the pH if a 25.0 mL solution originally containing 0.125 moles of quinine is titrated with HCI to the equivalence point, and if the combined total volume at the end is 56.0 mL?
a. 8.72
b. 5.10
c. 4.28
d. 7.98
