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Lithium metal is manufactured by electrolysis of lithium salts - VCE - SSCE Chemistry - Question 20 - 2009 - Paper 1
Question 20
Lithium metal is manufactured by electrolysis of lithium salts. Which of the following would be the best choice for the electrolyte and the anode in a commercial ce... show full transcript
Worked Solution & Example Answer:Lithium metal is manufactured by electrolysis of lithium salts - VCE - SSCE Chemistry - Question 20 - 2009 - Paper 1
Step 1
electrolyte and anode
Answer
The best choice for the electrolyte and the anode in a commercial cell for the electrolysis of lithium salts is option D: molten LiCl and a carbon rod.
Justification:
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Electrolyte Choice:
- Melting Point: Molten LiCl has a lower melting point compared to LiCl solution, allowing for easier electron movement and higher efficiency during electrolysis.
- Conductivity: Molten LiCl provides better ionic conductivity than a LiCl solution, enabling more effective ion movement, which is crucial for lithium extraction.
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Anode Material:
- Carbon Stability: A carbon rod is preferred as it is chemically stable in the electrolysis process involved with molten LiCl and does not react with lithium ions, allowing for consistent current flow.
In contrast, using LiCl solution may involve water during the electrolysis, which can lead to the formation of by-products and reduce efficiency.