The electrolysis of some other solutions using inert electrodes
2 marks · HardPredict the products formed at the electrodes when an aqueous solution of copper(II) bromide is electrolysed using inert electrodes.
State the product formed at:
the cathode
the anode
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Copper (Cu)
(b) Bromine (Br₂)
Also accept: Accept 'hydrogen' for the cathode if justified, but copper is expected.; Accept 'bromine' or 'Br₂' for the anode.
Common mistakes: Copper at the anode or bromine at the cathode.; Confusing half-equations.
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Marking points
B1 (a) · 1 mark · Copper (Cu) identified as cathode product.
B2 (b) · 1 mark · Bromine (Br₂) identified as anode product.
Worked solution
Copper(II) ions are below hydrogen in the reactivity series, so copper is deposited at the cathode:
Bromide ions are present in solution and discharge at the anode forming bromine: