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What % of the carbon in the H(2)CO(3)-HC...

What `%` of the carbon in the `H_(2)CO_(3)-HCO_(3)^(-)` buffer should be in the form of `HCO_(3)^(-)` so as to have a neutral solution? `(K_(a)=4xx10^(-7))`

A

`20%`

B

`40%`

C

`60%`

D

`80%`

Text Solution

Verified by Experts

`pH=pK_(a)+log(([HCO_(3)^(-)])/([H_(2)CO_(3)]))rArr 7=8-log4+log(([HCO_(3)^(-)])/([H_(2)CO_(3)]))rArr log(([HCO_(3)^(-)])/([H_(2)CO_(3)]))=4`
`%` of carbon in the form of `HCO_(3)^(-)=([HCO_(3)^(-)])/(HCO_(3)[H_(2)CO_(3)])xx100=(4)/(1+4)xx100=80%`
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