Calculate the PH of a 0 $\times$ 10^-5)

Multiple Choice

Calculate the pH of a 0.49 M solution of NaC₂H₃O₂ (for HC₂H₃O₂ K_a = 1.8 $\times$ 10^-5) .

A) 4.78
B) 9.22
C) 8.95
D) 5.05
E) none of these