Cell diagrams

[Celeste 1I]

For some of the answers in the book they add Platinum to the cell diagram, or is already in the diagram and seems random to me. Why do they sometimes add Pt?

[705170809]

In order for a cell diagram to work, you need a metal conductor. If a metal conductor isn't found in the anode or cathode, Pt is added.

[Andrew Bennecke]

For certain cell diagrams that contain electrodes without solids, i.e, only aqueous solutions, require metal conductors and platnium works best.

[Diana Sandoval 1K]

If there is no solid or metal added they include Pt or C in order for it to work.

[Mona El Masri 1F]

Add P(t) solid to any side of the reaction that doesn't have a solid. So, if you only have gas, aqueous, or liquid on one side of the reaction, you need to add P(t). If there is a solid in one reaction and not the other, you still have to add Pt to the reaction without the solid.

[anthony_trieu2L]

That is correct. The only exception for liquids is mercury liquid, which is a good conductor of electricity. Therefore, if mercury liquid is present, you do not need to add Pt.

[Jasmine Chow 1F]

If there are no solid metals in the reaction then you would ad Pt (solid) as the reaction needs a solid metal to work therefore Pt (solid) or C(Gr) are often used to replace these needed elements.

[AlyssaBei_1F]

If the anode or cathode does not include a solid, you add Pt(s) to whatever side does not have a solid. The aqueous solutions always go near the line (I). For example Pt(s) I Na (aq) II cathode.

[LedaKnowles2E]

Pt is sometimes added when one half of the reaction only involves aqueous solutions and a solid electrode is needed.