Calculate [H⁺] in a 1

Multiple Choice

Calculate [H⁺] in a 1.0 M solution of Na₂CO₃ (for H₂CO₃, K_a1 = 4.3  10^-7 and K_a2 = 5.6  10^-11) .

A) 6.6  10^-4 M
B) 7.5  10^-13 M
C) 7.5  10^-6 M
D) 1.3  10^-2 M
E) none of these