Hydrazine (N2H4\text{N}_2\text{H}_4N2H4) reacts with the hydrogencarbonate ion (HCO3−\text{HCO}_3^-HCO3−) in aqueous solution according to the following equilibrium:
N2H4(aq)+HCO3−(aq)⇌N2H5+(aq)+CO32−(aq) \text{N}_2\text{H}_4(\text{aq}) + \text{HCO}_3^-(\text{aq}) \rightleftharpoons \text{N}_2\text{H}_5^+(\text{aq}) + \text{CO}_3^{2-}(\text{aq}) N2H4(aq)+HCO3−(aq)⇌N2H5+(aq)+CO32−(aq)Which of the following represents a conjugate acid-base pair in this reaction?
N2H4\text{N}_2\text{H}_4N2H4 and CO32−\text{CO}_3^{2-}CO32−
HCO3−\text{HCO}_3^-HCO3− and N2H5+\text{N}_2\text{H}_5^+N2H5+
N2H5+\text{N}_2\text{H}_5^+N2H5+ and N2H4\text{N}_2\text{H}_4N2H4
HCO3−\text{HCO}_3^-HCO3− and N2H4\text{N}_2\text{H}_4N2H4
