In the following reaction, HCO3− is the conjugate acid of which base?
HCO3−+H2O⇌H3O++CO2−3
A
H3O+
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B
H2CO3
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C
CO2−3
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D
H2O
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Solution
The correct option is DCO2−3 Carbonic acid is a polyprotic acid. It is diprotic as it has two protons. There are two dissociation constants. First one for the dissociation into bicarbonate ion and the second constant is for the dissociation of the bicarbonate ion into the carbonate ion.