An acidic solution of KMnO₄(aq) is added dropwise to a solution of FeSO₄(aq) until…

CHEMISTRY · Single correct · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

An acidic solution of KMnO₄(aq) is added dropwise to a solution of FeSO₄(aq) until the purple color disappears and the solution becomes nearly colorless. Which net ionic equation best represents the reaction? (a) MnO4−(aq)+2 H2O(l)+3 Fe2+(aq)  ⟶  MnO2(s)+4 OH−(aq)+3 Fe3+(aq)\text{MnO}_4^{-}(aq) + 2\,\text{H}_2\text{O}(l) + 3\,\text{Fe}^{2+}(aq) \;\longrightarrow\; \text{MnO}_2(s) + 4\,\text{OH}^{-}(aq) + 3\,\text{Fe}^{3+}(aq) (b) MnO4−(aq)+Fe2+(aq)  ⟶  MnO42−(aq)+Fe3+(aq)\text{MnO}_4^{-}(aq) + \text{Fe}^{2+}(aq) \;\longrightarrow\; \text{MnO}_4^{2-}(aq) + \text{Fe}^{3+}(aq) (c) MnO4−(aq)+5 Fe2+(aq)+8 H+(aq)  ⟶  Mn2+(aq)+5 Fe3+(aq)+4 H2O(l)\text{MnO}_4^{-}(aq) + 5\,\text{Fe}^{2+}(aq) + 8\,\text{H}^{+}(aq) \;\longrightarrow\; \text{Mn}^{2+}(aq) + 5\,\text{Fe}^{3+}(aq) + 4\,\text{H}_2\text{O}(l) (d) MnO4−(aq)+5 Fe3+(aq)+8 H+(aq)  ⟶  Mn2+(aq)+5 Fe2+(aq)+4 H2O(l)\text{MnO}_4^{-}(aq) + 5\,\text{Fe}^{3+}(aq) + 8\,\text{H}^{+}(aq) \;\longrightarrow\; \text{Mn}^{2+}(aq) + 5\,\text{Fe}^{2+}(aq) + 4\,\text{H}_2\text{O}(l)

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