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Question

10 mL of 0.1 M tribasic acid H3A is titrated with 0.1 M NaOH solution. What is the ratio of [H3A][A3] at 2nd equivalence point? [Given that: Ka1=103, Ka2=108, Ka3=1012]

A
104
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B
10+4
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C
107
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D
10+6
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