Displacement reactions involving solutions of salts
2 marks · EasyWrite the ionic half-equation for the oxidation step, showing iron metal reacting to form iron(II) ions in a displacement reaction.
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Fe(s) \to Fe^{2+}(aq) + 2e^-
Also accept: Fe(s) \rightarrow Fe^{2+}(aq) + 2e^-
Common mistakes: Incorrect number of electrons; Wrong charge on iron ion
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Marking points
M1 · 1 mark · Correct formulae for iron and iron(II) ion.
A1 · 1 mark · Correct balancing with 2 electrons and correct states.
Worked solution
The ionic half-equation for the oxidation of iron is: