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The pH of the a solution containing 0.4 ...

The pH of the a solution containing `0.4 M HCO_(3)^(-)` is :
`[K_(a_(1)) (H_(2)CO_(3)) = 4 xx 10^(-7), K_(a_(2)) (HCO_(3)^(-)) = 4 xx 10^(-11)]`

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