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Pt in Cell diagrams

Posted: Tue Feb 20, 2018 11:50 am
by Deborah Cheng 1F
How do you know when it is necessary to put an electrode such as Pt on each end of the cell diagram?

Re: Pt in Cell diagrams

Posted: Tue Feb 20, 2018 12:08 pm
by Qining Jin 1F
Pt is necessary when both the oxidized and reduced species are in the same solution

Re: Pt in Cell diagrams

Posted: Tue Feb 20, 2018 9:37 pm
by Amanda Wu 2C
There are also cases in which a Pt electrode is necessary even if one of the species is not in solution. Such an example includes I2 (s). Because it isn't a metal and is a poor conductor of electricity, it is necessary to have a Pt electrode in this case even if the species is a solid. On the opposite end of the spectrum, there are some cases in which a Pt electrode is unnecessary even if the species is a liquid as in the case of mercury (Hg (l)), which is a liquid metal capable of conducting electricity at standard temperature and conditions.

Re: Pt in Cell diagrams

Posted: Tue Feb 20, 2018 11:34 pm
by Rakhi Ratanjee 1D
Aren't the oxidized and reduced species always in the same solution?

Re: Pt in Cell diagrams

Posted: Tue Feb 20, 2018 11:37 pm
by Eli Aminpour 2K
The inert electrode is necessary to make the electrons flow. You need this when the ions are aqueous or gaseous. You don't need it if there is a conducting solid.