Pt(s) in a cell diagram

[Natalie LeRaybaud 1G]

I noticed that most of the solutions with cell diagrams from the homework include Pt(s) on one or both of the ends of the cell diagrams. Can someone please explain in which cases we add Platinum to the cell diagram and how we know whether it is on the anode side, cathode side, or both.

[Harrison Wang 1H]

For either the cathode or anode, if there is no conducting solid, then Pt(s) will be placed there. For example, if the reaction at the anode consists of Fe+2(aq) -> Fe+3 + e-, then Pt(s) will be placed on that side.