What is the selenide ion concentration [Se2-] for a 0.100 mol L-1 H2Se solution that has the stepwise dissociation constants of Ka1 = 1.3 × 10-4 and Ka2 = 1.0 × 10-11?
A) 3.6 × 10-3 mol L-1
B) 1.3 × 10-4 mol L-1
C) 1.3 × 10-5 mol L-1
D) 1.0 × 10-11 mol L-1
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