Phosphoric acid and carbonic acid species interact according to the equilibrium…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Phosphoric acid and carbonic acid species interact according to the equilibrium below: H2CO3+HPO42−⇌HCO3−+H2PO4−H_2CO_3 + HPO_4^{2-} \rightleftharpoons HCO_3^- + H_2PO_4^- Which of the following lists all conjugate acid–base pairs present in this reaction? (a) (H2CO3/HCO3−) and (HPO42−/PO43−)(H_2CO_3 / HCO_3^-)\text{ and }(HPO_4^{2-} / PO_4^{3-}) (b) (H2CO3/HCO3−) and (H2PO4−/HPO42−)(H_2CO_3 / HCO_3^-)\text{ and }(H_2PO_4^- / HPO_4^{2-}) (c) (H2CO3/HCO3−)(H_2CO_3 / HCO_3^-) only (d) (H2CO3/HPO42−) and (HCO3−/H2PO4−)(H_2CO_3 / HPO_4^{2-})\text{ and }(HCO_3^- / H_2PO_4^-)

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