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When writing cell diagrams how do we know what type of electrode to add to either anode or cathode. There are Platinum electrodes and sometimes carbon is written in the form C(gr)? what is the explanation behind this?
If there is solid metal in the redox reaction (like Cu), then that can be used as the anode or cathode. If there is no solid metal (like Fe3+ to Fe2+), then a nonreactive metal like C (graphite) or Platinum should be used.
An inert electrode (Pt) should be used if the reactants cannot act as an electrode. For example, if you have ions or gases then Pt is needed. However, if you have a solid metal, then it can be used as the electrode.
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