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You add platinum or another inert electrode when both oxidized and reduced species are in the same solution. It is easy to tell when you look at the phases in the equation, since the electrode is always a solid, so whenever one side of the cell doesn't have a solid you need to add an inert electrode like platinum.
Angela Wu-2H wrote:Nohemi Garcia 1L wrote:I believe you add platinum to a cell diagram when the anode and/or the cathode need a solid conductor.
How do we know/tell if the anode or cathode needs a solid conductor?
We know we do based on the phases of the molecules. If it's just aqueous phases, then you'll definitely need one. Even in cases where there is a metal but it's not in a solid phase (such as Fe (aq)) you will need to add platinum. Sorry for the late response.
ASetlur_1G wrote:You add platinum when there's no solid in either the anode or cathode of the cell (like if there's only an aqueous solution). You add it to the side without a solid.
And you can add platinum because it is an inert metal and won't react with anything causing values to change
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