A solution of Na₂SO₃(aq) is acidified with an excess of HCl(aq)

CHEMISTRY · Single correct · A Level · Chemistry · Reactions of ions in aqueous solution · Reactions of ions in aqueous solution

Problem

A solution of Na₂SO₃(aq) is acidified with an excess of HCl(aq). Bubbles of a colorless gas are observed. Which net ionic equation best represents the change occurring? (a) S2−(aq)+2 H+(aq)  ⟶  H2S(g)\mathrm{S^{2-}(aq)+2\,H^+(aq)\;\longrightarrow\;H_2S(g)} (b) SO32−(aq)+2 H+(aq)+2 Cl−(aq)  ⟶  SO2(g)+H2O(l)+2 Cl−(aq)\mathrm{SO_3^{2-}(aq)+2\,H^+(aq)+2\,Cl^-(aq)\;\longrightarrow\;SO_2(g)+H_2O(l)+2\,Cl^-(aq)} (c) SO32−(aq)+2 H+(aq)  ⟶  SO2(g)+H2O(l)\mathrm{SO_3^{2-}(aq)+2\,H^+(aq)\;\longrightarrow\;SO_2(g)+H_2O(l)} (d) SO32−(aq)+2 H+(aq)  ⟶  H2SO3(aq)\mathrm{SO_3^{2-}(aq)+2\,H^+(aq)\;\longrightarrow\;H_2SO_3(aq)}

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