Chemistry

Problem

A student mixes equimolar solutions of

HCO_3^-(aq)

and

HPO_4^{2-}(aq)

. Four classmates suggest different proton-transfer equations to describe the principal reaction. Which equation is most likely to represent the predominant acid–base process? a) No proton transfer occurs because both ions behave exclusively as bases in water. b)

HCO_3^-+HPO_4^{2-}\to CO_3^{2-}+H_2PO_4^-

HCO_3^-+HPO_4^{2-}\to H_2CO_3+PO_4^{3-}

HCO_3^-+HPO_4^{2-}\to CO_3^{2-}+PO_4^{3-}

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