For Carbonic Acid (H₂CO₃), K_a1 = 4

Multiple Choice

For carbonic acid (H₂CO₃) , K_a1 = 4.30 × 10^-7 and K_a2 = 5.62 × 10^-11. Calculate the pH of a 0.50 M solution of Na₂CO₃.

A) 11.97
B) 8.31
C) 10.67
D) 2.03
E) 3.33