Problem- What is the hydronium-ion concentration in a 0.025 M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2 * 10^-7 and Ka2= 4.8 * 10^-11?
A) 5.1 * 10^-5 M
B) 2.5 * 10^-2 M
C) 4.8 * 10^-11
D) 1.0 * 10^-4
E) 4.2 * 10^-7 M
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