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In aqueous solution, the ionization constants for carbonic acid are
`K_(1)=4.2xx10^(-7) and K_(2)=4.8xx10^(-11)`.
Select the correct statement for a saturated 0.034 M solution of the carbonic acid.
A. The concentrations of `H^(+)` and `HCO_(3)^(-)` are approximately equal.
B. The concentration of `H^(+)` is double that of `CO_(3)^(-)`.
C. The concentration of `CO_(3)^(2-)` is 0.034 M.
D. The concentration of `CO_(3)^(2-) ` is greater than that of `HCO_(3)^(-)`.

1 Answer

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Correct Answer - A
`H_(2)CO_(3)hArr H^(+)HCO_(3)^(-), K_(1)=4.2xx10^(-7)`
`HCO_(3)^(+)hArrH^(+)+CO_(3)^(2-),K_(2)=4.8xx10^(-11)`
As `K_(2)lt lt K`, concentrations of `H^(+)` and `HCO_(3)^(-)` will be approximately equal.

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