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Question
Write the electrode reactions involved in Hall-Heroult’s process.
Chemical Equations/Structures
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Solution
At cathode: \[\ce{Al^{3+} + 3e- -> Al}\]
At anode: \[\ce{2O^{2-} -> O2 + 4e-}\]
The oxygen formed reacts with the carbon anode:
\[\ce{C + O2 -> CO2}\]
Overall reaction: \[\ce{2Al2O3 + 3C -> 4Al + 3CO2}\]
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Chapter 7: Metallurgy - Intext Question [Page 153]
