Platinum

[205192823]

When writing out the cell diagram when do you know when to use Pt and not to use Pt?

[Izzie Capra 2E]

You use Pt and put it in the cell digram when the half-reactions/species you are working with do not have a conducting solid. So say, all your molecules are ions in an aqueous solution, then you need a conducting solid to function as the electrode. You can use Pt because it is one of the most common conducting solids.

[Minh Ngo 4G]

You use Plt (s) when you don’t have an inert conducting metal solid

[rabiasumar2E]

You add Pt to your cell diagram when there is no conducting solid in any of your half-reactions.

[Daniel Toscano 1L]

Pt or another inert conducting metal solid is used when there is not an inert conducting metal solid in the equation.

[Hailey Kim 4G]

You include Pt(s) when there is no solid metal conductor. For example, for problem 6M.11 (part a), the cell diagram would be:
| Pt(s) | Ti3+(aq), Ti2+(aq) || Co2+(aq) | Co(s)

[kim 2I]

Examples that would require Pt(s) include only having aqueous ions to aqueous ions or aqueous ions to gases as the phase change. An exception is liquid mercury that can act as a conductor.