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It's more based on the anode and cathode. So say you have Cu2+(aq) + 2Cr2+ (aq) ---> 2Cr3+(aq) + Cu(s). Since the Cr is the one losing electrons, it will be on the anode side and since Cu is gaining electrons, it will be on the cathode side. So it will look like: Pt(s) | Cr3+, Cr2+(aq) || Cu2+(aq) | Cu(s). The solids are on the outside and ions on the inside. Since the anode side doesn't have a solid, we can use platinum because it's a neutral solid.
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