The Titration of a Weak Acid, HA ( K _a

Multiple Choice

The titration of a weak acid, HA ( K _a = 1.0×10 ^{- 4}) , with NaOH requires 40.0 mL to reach the equivalence point. The pH after 20 mL is

A) Strongly alkaline, approximately 12
B) Moderately alkaline, approximately 10
C) Slightly alkaline, approximately 8
D) Neutral, approximately 7
E) Moderately acidic, approximately 4