A 250 ML Volume of a 0

Multiple Choice

A 25.0 mL volume of a 0.200 M N₂H₄ solution ( K _b = 1.70×10 ^{- 6}) is titrated to the equivalence point with 0.100 M HCl. What is the pH of this solution at the equivalence point?
The titration is:
N₂H₄ + HCl→N₂H₅⁺ + Cl ^-

A) 4.70
B) 8.23
C) 7.00
D) 9.30
E) 5.77