In the equilibrium

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

Problem

In the equilibrium HS−(aq)+HPO42−(aq)⇌S2−(aq)+H2PO4−(aq)HS^{-}(aq)+HPO_4^{2-}(aq)\rightleftharpoons S^{2-}(aq)+H_2PO_4^{-}(aq), which species functions as the Brønsted–Lowry base in the forward direction? (a) S2−S^{2-} (b) HPO42−HPO_4^{2-} (c) HS−HS^{-} (d) H2PO4−H_2PO_4^{-}

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