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K1 and K2 for carbonic acid are 4.45 xx ...

`K_1 and K_2` for carbonic acid are `4.45 xx 10^(-11)` and `4.09 xx 10^(-11)`. Calculate the concentrations of `HCO_(3)^(-) . CO_(3)^(2-)` and pH of centimolar `H_2 CO_3`.

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`6.7 xx 10^(-5) M ,4.7 xx 10^(-11) M and 4.2`
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