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Oxidation and Reduction

How would you...

Question

How would you determine the standard electrode potential of the systemMg²⁺| Mg?
In the answer why SHE is only taken as cathode,why not anode?

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Solution

In the cell Mg⁺⁺ | Mg reduction of ions occurs and hence the electrode behaves as cathode.
As the SHE can behave as both anode and cathode here it will behave as an anode.

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