The simplified diagram below represents a cell used to electroplate an iron medal with a thin layer of gold - NSC Physical Sciences - Question 9 - 2017 - Paper 2
Question 9
The simplified diagram below represents a cell used to electroplate an iron medal with a thin layer of gold.
1. Is this an ELECTROLYTIC or a GALVANIC cell?
2. Whi... show full transcript
Worked Solution & Example Answer:The simplified diagram below represents a cell used to electroplate an iron medal with a thin layer of gold - NSC Physical Sciences - Question 9 - 2017 - Paper 2
Step 1
Is this an ELECTROLYTIC or a GALVANIC cell?
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Answer
This is an electrolytic cell because an external power source (battery) is used to drive the electroplating process.
Step 2
Which electrode, P or the Medal, is the anode?
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Answer
Electrode P is the anode in this setup, as it undergoes oxidation.
Step 3
Write down the following:
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Answer
Step 4
Besides improving appearance, state ONE other reason why the medal is electroplated.
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Answer
One reason for electroplating the medal is to prevent rust and increase its durability.
Step 5
State ONE of the two possible changes that should be made to the cell above to electroplate the medal with silver instead of gold.
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Answer
To electroplate the medal with silver, you could replace the AuCl3 electrolyte with AgNO3 (silver nitrate).
