A 200-ML Sample of 0

A 20.0-mL sample of 0.30 M HClO was titrated with 0.30 M NaOH. The following data were collected during the titration. Determine to K_a for HClO.

A) 1.1 × 10^-7
B) 3.5 × 10^-8
C) 1.2 × 10^-8
D) 4.9 × 10^-11
E) None of the answers is correct.