Label the acid-base and conjugate acid-base pairs? HCO3–(aq)+ H2O(l) ---->H2CO3(aq)+ OH–(aq)

##HCO_3^(-) + H_2O -> H_2CO_3 + OH^-## ##Base + Acid -> Conj A + Conj B##

On the reactant side of the equation the water (##H_2O##) is the Acid as it is the hydrogen ion donor to the bicarbonate (##HCO_3^-##) which is the Base as it receives the hydrogen ion..

On the product side the Carbonic Acid (##H_2CO_3##) is the Conjugate Acid as it is the hydrogen donor to the Conjugate Base (##OH^-##) as it receives the hydrogen ion.

##HCO_3^(-) -> H_2CO_3 ## ##Base -> Conj A## The Carbonic Acid (##H_2CO_3##) is the Conjugate Acid pair to the Base bicarbonate (##HCO_3^-##) .

##H_2O -> OH^-## ##Acid -> Conj B##

The Hydroxide (##OH^-##) is the Conjugate Base pair to the Water (H_2O).

I hope this was helpful. SMARTERTEACHER