Determine the Concentration of CO₃^2- Ions in a 0

Multiple Choice

Determine the concentration of CO₃^2- ions in a 0.18 mol L^-1 H₂CO₃ solution.Carbonic acid is a diprotic acid with K_a1 = 4.3 × 10^-7 and K_a2 = 5.6 × 10^-11.

A) 2.8 × 10^-4 mol L^-1
B) 3.2 × 10^-6 mol L^-1
C) 5.6 × 10^-11 mol L^-1
D) 4.3 × 10^-7 mol L^-1
E) 6.9 × 10^-8 mol L^-1