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Platinum in cell diagram

Posted: Mon Feb 24, 2020 10:29 am
by Abigail Menchaca_1H
Why do we use Platinum when drawing the cell diagram?

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 10:33 am
by Paul Hage 2G
Platinum is introduced into the cell diagram when there are no solid metals as part of the anode or cathode of the cell diagram. It serves as an inert electrode (provides a surface for the transfer of electrons, but does not affect or participate in the redox reaction).

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 12:01 pm
by Shail Avasthi 2C
You need a solid metal to conduct the flow of electrons when both compounds of your anode or cathode are in aqueous solution. Platinum is used when it is not involved in the chemistry of the galvanic cell, and therefore will not be oxidized or reduced while acting as a conducting metal.

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 12:02 pm
by Jack Riley 4f
You need a metal to conduct the electrons and platinum is inert and doesn't interfere with the redox reaction

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 2:34 pm
by Abhi Vempati 2H
In addition to what everyone is saying, there was a specific example done in lecture.

In his example last Friday, Professor Lavelle showed a cell with copper and iron in it. In the copper half reaction, Cu(s) was present, so we can use the solid itself as an electrode. However, in the iron half reaction, there was Fe2+(aq) and Fe3+(aq). There's no solid to act as an electrode, which is why we need something like platinum to be that electrode. Hope this helps!

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 3:08 pm
by charleejohnson1L
Paul Hage 2G wrote:Platinum is introduced into the cell diagram when there are no solid metals as part of the anode or cathode of the cell diagram. It serves as an inert electrode (provides a surface for the transfer of electrons, but does not affect or participate in the redox reaction).

^^ this! also when you write it with the | and ||, it will always go on the ends :) I hope this helps!

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 4:56 pm
by Bilal Pandit 1J
You always need something solid that can act as the actual electrode, so you would use a metal like Pt as that electrode.

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 6:45 pm
by pmokh14B
Because you need a material that can act as an electrode but not be involved in the reaction.

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 7:14 pm
by Robin Cadd 1D
Paul Hage 2G wrote:Platinum is introduced into the cell diagram when there are no solid metals as part of the anode or cathode of the cell diagram. It serves as an inert electrode (provides a surface for the transfer of electrons, but does not affect or participate in the redox reaction).

Another important point to note: platinum is not the only inert electrode. Graphite can also serve this same purpose, but it’s less common.

Re: Platinum in cell diagram

Posted: Mon Feb 24, 2020 11:14 pm
by Katie Bart 1I
Could you use other metals? Or only Pt?

Re: Platinum in cell diagram

Posted: Tue Feb 25, 2020 4:05 pm
by ABombino_2J
Graphite and gold are some other metals that also work in place of platinum.