Calculate [H+] in a 1.0 M solution of Na2CO3 (for H2CO3, Ka1 = 4.3 × 10-7 and Ka2 = 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
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