The Titration of a Weak Base ( K _b =

Multiple Choice

The titration of a weak base ( K _b = 1.0×10 ^{- 4}) with HCl requires 40.0 mL to reach the equivalence point. In order to calculate the pH of the system after 20 mL of HCl is added, the best strategy is to recognize that the system is

A) a strong base
B) a weak base
C) a buffer
D) neutral
E) a strong acid