An arrangement to demonstrate the electrolysis of molten lead bromide (PbBr₂) using inert electrodes is shown in the diagram - Leaving Cert Chemistry - Question c A - 2013
Question c A
An arrangement to demonstrate the electrolysis of molten lead bromide (PbBr₂) using inert electrodes is shown in the diagram. The demonstration is carried out in a f... show full transcript
Worked Solution & Example Answer:An arrangement to demonstrate the electrolysis of molten lead bromide (PbBr₂) using inert electrodes is shown in the diagram - Leaving Cert Chemistry - Question c A - 2013
Step 1
What is meant by electrolysis?
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Answer
Electrolysis is the process of producing a chemical change, including reactions such as decomposition, when an electric current is passed through an electrolyte, which can be in the form of an ionic melt or an ionic solution.
Step 2
Why must the lead bromide be molten?
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Answer
Lead bromide must be molten to ensure that the ions are free to move. In its solid state, the ionic bonds restrict the movement of ions, preventing the conduction of electricity.
Step 3
Suggest a suitable material for the electrodes.
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A suitable material for the electrodes is platinum (Pt) or carbon (graphite), both of which are inert and can conduct electricity without participating in the reactions.
Step 4
Write balanced half equations for the reactions that occur at the electrodes during the electrolysis.
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At the cathode (reduction):
Pb2++2e−→Pb
At the anode (oxidation):
2Br−→Br2+2e−
Step 5
Name a metal, other than lead, that is extracted from one of its compounds by electrolysis.
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Sodium can be extracted from sodium chloride (NaCl) through the process of electrolysis.
Step 6
Name the compound that is electrolyzed to produce this metal.
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The compound that is electrolyzed to produce sodium is sodium chloride (NaCl).
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