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The pH of a solution containing 0.4 M HC...

The pH of a solution containing 0.4 M `HCO_(3)^(-)` and 0.2 M `CO_(3)^(2-)` is :
`[K_(a1)(H_(2)CO_(3))=4xx10^(-7)` , `K_(a2)(HCO_(3)^(-))=4xx10^(-11)]`

A

`10.4`

B

`10.1`

C

`6.1`

D

`10.7`

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