Displacement reactions involving solutions of salts
3 marks · EasyChromium is added to copper(II) sulfate solution. Chromium displaces copper from the solution.
(a)[2 marks]
Write the ionic half-equation for the reduction step.
(b)[1 mark]
Write the ionic half-equation for the oxidation step.
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(a) Cu^{2+}(aq) + 2e^- \to Cu(s)
(b) Cr(s) \to Cr^{2+}(aq) + 2e^-
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Marking points
M1 (a) · 1 mark · Correct ions and states for reduction half-equation.
A1 (a) · 1 mark · Balanced electron transfer and states in reduction equation.
A2 (b) · 1 mark · Correct oxidation half-equation for chromium.
Worked solution
a) Reduction half-equation:
b) Oxidation half-equation: