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 `0.034M` solution of the carbonic acid.

Options

A. The concentration of `H^(+)` and `HCO_(3)^(-)` are approximately equal
B. The concentration of `H^(+)` is double that of `CO_(3)^(2-)`
C. The concentration of `CO_(3)^(2-)` is 0.034M
D. The concentration of `CO_(3)^(2-)` is greater than that of `HCO_(3)^(-)`

Answer

A

Explanation

`H_(2)CO_(3) hArr H^(+)+HCO_(3)^(-) , K_(1) =4.2 xx 10^(-7)`
`HCbar(O)_(3) hArr H^(+)+CO_(3)^(2-),K_(2)=4.8 xx 10^(-11)`
`:. K_(2) lt lt K_(1)`, concentration of `H^(+)` and `HCO_(3)^(-)`
will be approximately equal