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Just to clarify, do you only have to use platinum as an electrode if there are no solids present in the cell diagram? What happens if there is solid present only on one of the sides of the cell diagram?
Typically you include a Pt electrode in the diagram if there is no solid present for either the anode reaction or the cathode reaction. So if there is a solid present on one side (Cu (s)) yet only aqueous solutions on the other (Fe2+(aq)), then you would use a Pt electrode on the side that lacks a solid electrode.
If there is a solid only on one side, then the other side will contain an inert solid like Platinum. The metal on the other side will not be used for both because you want a metal that won't affect the reaction.
Usually you use Pt as an electrode in the diagram if there is no solid present for either the anode reaction or the cathode reaction. Lavelle mentioned that graphite can also be used, but it's not nearly as common as Platinum.
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