Displacement reactions involving solutions of salts
2 marks · NormalWrite the ionic equation for the reaction that occurs when a strip of magnesium is placed into a solution of iron(II) sulfate.
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Mg(s) + Fe^{2+}(aq) \rightarrow Mg^{2+}(aq) + Fe(s)
Also accept: \ce{Mg (s) + Fe^{2+} (aq) -> Mg^{2+} (aq) + Fe (s)}; Mg(s) + Fe2+(aq) -> Mg2+(aq) + Fe(s)
Common mistakes: Including sulfate ions; Reversing products and reactants
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Marking points
M1 · 1 mark · Writing correct ions and states for the magnesium and iron(II) ions.
A1 · 1 mark · Balancing the ionic equation correctly.
Worked solution
The ionic equation only includes the species that change: magnesium atoms, and iron(II) ions.