Electrolysis Molten Metal Halides (Salts)

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During the electrolysis of molten calcium bromide (CaBr2) and magnesium iodide (MgI2), bromine gas is produced at the anode from the oxidation of bromide ions. The process at the anode is oxidation, as bromide ions lose electrons. In terms of thermodynamic feasibility, the decomposition of calcium bromide is generally considered more spontaneous than that of magnesium iodide. This is due to the lower standard electrode potential of calcium compared to magnesium, making the oxidation of bromide ions more favorable. Overall, electrolysis of CaBr2 is thermodynamically easier to achieve than that of MgI2.
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What substance is produced at the anode during the electrolysis of a mixture of molten calcium bromide and molten magneius iodide?
 
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What process takes place at the anode, i.e. oxidation or reduction?

http://www.science.uwaterloo.ca/~cchieh/cact/c123/eltlysis.html

Given the choice between CaBr2 and MgI2, the decomposition of which would be more spontaneous, or rather which one is thermodynamically easier to achieve?
 

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