Displacement reactions involving solutions of salts
2 marks · HardWhen zinc metal reacts with iron(II) sulfate solution, write the ionic half-equation for the reduction step in this displacement reaction.
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Fe^{2+}(aq) + 2e^- \rightarrow Fe(s)
Also accept: Fe^{2+}(aq) + 2e^- \rightarrow Fe(s)
Common mistakes: Writing the oxidation half-equation instead of reduction; Incorrect charge or number of electrons
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Marking points
M1 · 1 mark · Shows correct species (Fe^{2+}(aq), electrons, Fe(s)).
A1 · 1 mark · Correctly balances the equation with two electrons and correct charge/states.
Worked solution
The reduction step is the gain of electrons by Fe^{2+} ions to form iron metal: