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The purpose of having the Pt is that it's an inert conductor that can transfer electrons. It's only needed when there's no conducting solids so it can do the work of moving the electrons from the anode to the cathode. Copper is a conducting solid, so the Pt isn't needed on that side. However, iron isn't a conducting solid, so the Pt is needed on that side. You can see this from the cell diagram, because it shows Cu(s)|Cu2+(aq) on one side, but the other side only has aqueous Fe.
having the Pt is because it's an inert conductor, so it doesn't affect the reaction. in the diagram it helps transfer electrons from anode to cathode. in the diagram copper is the conducting solid, whereas iron isnt a conducting solid, so the Pt would be with the iron.
The iron is in an aqueous phase, meaning that it is not a conducting solid. Thus, in the way that Cu (s) acts as an electrode, we use an inert conductor(Pt (s)) as an electrode to transfer electrons on the side with the iron.
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