For H₃PO₃, Which Is Actually a Diprotic Acid, K_a1 =

For H₃PO₃, which is actually a diprotic acid, K_a1 = 1.0 × 10^-2 and K_a2 = 2.6 × 10^-7. Calculate a value for the [H⁺] in a 0.500 molar solution of H₃PO₃.

A) 1.0 × 10^-2 mol L^?1
B) 6.6 × 10^-2 mol L^-1
C) 7.1 × 10^-2 mol L^-1
D) 8.5 × 10^-3 mol L^-1
E) 3.3 × 10^-3 mol L^-1