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In the solutions manual for the 6th edition 14.13, it states that "Pt is necessary when both oxidized and reduced species are in the same solution" and that it is necessary for "gas/ion electrode reactions"
Pt(s) is an inert electrode, meaning it helps with either reduction or oxidation without actually being changed in the reaction. It must be included in the cell diagram when an solid metal is not present on either the anode or cathode side. It aids in either the reduction or oxidation of aqueous ions.
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