Pt in cell diagrams

[nehashetty_2G]

When does the Pt go on both sides of the cell diagram and when does it not? For example, in Problem 6M.5 the Pt is only on the right side of the diagram.

Also, in general, how do you determine when to use Pt? Are there specific rules for it?

[Janet Nguy 2C]

Pt is kind of like an inert metal (you can think of it that way); it acts literally as a solid metal to be the physical electrode for the sides of the battery that don't already have a solid metal to do this.

Pt is used in cell diagrams if there's no solid metal in either the anode or cathode.

[Sanjana K - 2F]

If there’s no solid conducting metal in one half of the cell diagram, then that half will have a platinum electrode.

[Michelle Xie 2B]

If there's no solid, Pt is used.