The diagram shows the electrolysis of molten lead bromide (PbBr₂) using inert electrodes - Leaving Cert Chemistry - Question B - 2007
Question B
The diagram shows the electrolysis of molten lead bromide (PbBr₂) using inert electrodes.
(i) Suggest a suitable material for the electrodes.
(ii) Identify the pro... show full transcript
Worked Solution & Example Answer:The diagram shows the electrolysis of molten lead bromide (PbBr₂) using inert electrodes - Leaving Cert Chemistry - Question B - 2007
Step 1
Suggest a suitable material for the electrodes.
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Answer
A suitable material for the electrodes in the electrolysis of molten lead bromide (PbBr₂) is platinum or silver. These materials are inert and can handle the electrochemical reactions without degrading.
Step 2
Identify the product formed at the cathode and also the product formed at the anode.
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Answer
At the cathode, lead (Pb) is formed as the reduction reaction takes place, while at the anode, bromine gas (Br₂) is produced as oxidation occurs. Thus, the products are
Cathode: Lead (Pb)
Anode: Bromine (Br₂)
Step 3
Why should this electrolysis be carried out in a fume cupboard?
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This electrolysis should be carried out in a fume cupboard because the process produces toxic fumes, specifically bromine vapors, which can pose serious health risks if inhaled. The fume cupboard provides necessary ventilation to avoid exposure.
Step 4
Name the pictured English chemist who coined the terms `electrode`, `electrolysis`, and `cathode` in 1832.
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The pictured English chemist is Michael Faraday, who made significant contributions to the field of electrochemistry, including the introduction of these important terms.
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