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I had a question about the cell diagram. If the anode or cathode has elements that do not go under a phase change we annotate it as Fe3+(aq),Fe2+(Aq)ΙPt(s) right? Also when there is no phase change and no metal we add a inert metal to the cell diagram right??
When an anode or cathode do not undergo a phase change, you're correct that you use a comma to separate the two instead of a bar. It is important to note that if there is a situation like this, you should place the oxidized element first and then the reduced element. Using your example, Fe3+(aq) is placed first since it's "more oxidized" (more positive, less negative) than Fe2+(aq), which is "more reduced" (less positive, more negative).
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