A Buffer Solution Is Made by Dissolving 0 $\times$ 10^-8

A buffer solution is made by dissolving 0.230 moles of sodium hypochlorite in 1.00 L of 0.220 M hypochlorous acid.What is the pH of the solution after 0.0100 moles of sodium hydroxide is added? (The K_a of HClO is 2.9 $\times$ 10^-8.)

A) 6.52
B) 6.40
C) 7.56
D) 7.48
E) 7.60