Calculate the PH at the Equivalence Point for the Titration

Multiple Choice

Calculate the pH at the equivalence point for the titration of 20.0 mL of 1.00 M HF with 0.500 M NaOH. K _a = 3.5×10 ^{- 4} for HF.

A) 1.73
B) 5.53
C) 12.3
D) 7.00
E) 8.49