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As mentioned, Pt stands for platinum. It is used as an inert conductor to transfer electrons when a half-reaction has no conducting solids. Platinum is written on the outermost part of the cathode side because it is a solid.
705302428 wrote:Pt meant platinum and it was used as an inert conductor/electrode to transfer electrons. We include it in the cell diagram on the cathode side.
But some problems in the textbook have Pt(s) on the anode side or both sides (6L.3 (d) and (e)). Why do some have it only on the cathode or anode side and others on both?
Pt (platinum) is used in examples like the one Lavelle discussed in class on friday where the redox reaction has two aqueous solutions that change charge without a solid, such as Fe. The platinum helps facilitate the reaction because otherwise there would be not way for the electrons to be transferred.
Jasmine Kim 1L wrote:But some problems in the textbook have Pt(s) on the anode side or both sides (6L.3 (d) and (e)). Why do some have it only on the cathode or anode side and others on both?
Each side of the cell diagram needs to have a conducting solid. In the problems that have Platinum on only one side, there already exists a conducting solid on the either.
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