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Carbonic acid (H(2)CO(3)), a diprotic ac...

Carbonic acid `(H_(2)CO_(3)),` a diprotic acid has `K_(a1)=4.0xx10^(-7)` and `K_(a2)=5.0xx10^(-11).` What is the `[CO_(3)^(2-)]` of a 0.025 M solution of carbonic acid?

A

`5.5xx10^(-9)`

B

`5.5xx10^(-8)`

C

`7.0xx10^(-9)`

D

`7.0xx10^(-11)`

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