Determine the concentration of CO32- ions in a 0.18 mol L-1 H2CO3 solution. Carbonic acid is a diprotic acid with Ka1 = 4.3 × 10-7 and Ka2 = 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
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