A solution containing hydrogen phosphate ions, HPO₄²⁻

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

Problem

A solution containing hydrogen phosphate ions, HPO₄²⁻, is titrated with HCl(aq) until it has been converted completely to dihydrogen phosphate ions. Which net ionic equation best represents the overall reaction? (a) PO43−(aq)+H+(aq)→HPO42−(aq)\mathrm{PO_4^{3-}(aq) + H^+(aq) \rightarrow HPO_4^{2-}(aq)} (b) HPO42−(aq)+H+(aq)→H2PO4−(aq)\mathrm{HPO_4^{2-}(aq) + H^+(aq) \rightarrow H_2PO_4^{-}(aq)} (c) HPO42−(aq)+2 H+(aq)→H3PO4(aq)\mathrm{HPO_4^{2-}(aq) + 2\,H^+(aq) \rightarrow H_3PO_4(aq)} (d) HPO42−(aq)→H+(aq)+PO43−(aq)\mathrm{HPO_4^{2-}(aq) \rightarrow H^+(aq) + PO_4^{3-}(aq)}

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