What Is the PH of a Buffer Composed of 0 $\times$

Multiple Choice

What is the pH of a buffer composed of 0.35 M H₂PO₄^-(aq) and 0.65 M HPO₄^2-(aq) ? (K_a of H₂PO₄^- is 6.2 $\times$ 10^-8)

A) 6.94
B) 7.21
C) 7.48
D) 7.73
E) 9.06