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If there is no solid metal in the anode or the cathode to carry a current, then you need to put Pt(s) in the cell diagram. Put it on the side lacking the solid metal (could be the cathode, anode, or both)
Pt(s) is put in the cell diagram when no solid is present in the redox reaction that is the metal electrode. Pt(s) is platinum and is added to the cell diagram to represent the inert metal electrode.
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