Cell Diagrams  [ENDORSED]

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Abigail Yap 2K
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Joined: Fri Sep 29, 2017 7:07 am

Cell Diagrams

Postby Abigail Yap 2K » Thu Feb 22, 2018 11:09 pm

What is the purpose of inert electrodes in galvanic cells? (i.e. Pt)

Thanks!

Andy Nguyen 1A
Posts: 56
Joined: Thu Jul 27, 2017 3:00 am

Re: Cell Diagrams

Postby Andy Nguyen 1A » Thu Feb 22, 2018 11:18 pm

These species that are added to the ends of the cell diagrams, like Pt, are inert electrodes that simply act as a way to transport the electrons.

Guangyu Li 2J
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Re: Cell Diagrams

Postby Guangyu Li 2J » Fri Feb 23, 2018 12:17 pm

Inert species allow the electrons transportation. In addition, in the cell diagrams, inert species should always be in the outermost locations. It is not usually involved in the calculations.

Hope this helps!

TarynLane2J
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Joined: Sat Jul 22, 2017 3:00 am

Re: Cell Diagrams

Postby TarynLane2J » Fri Feb 23, 2018 12:27 pm

Inert species such as platinum are usually used as electrodes when the species in the redox reaction are nonmetal and aren't able to transport electrodes. But if the species in the redox reaction is already a conductor such as copper or some other metal, then you don't need to add a platinum electrode.

Christina Bedrosian 1B
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Joined: Fri Sep 29, 2017 7:05 am

Re: Cell Diagrams

Postby Christina Bedrosian 1B » Fri Feb 23, 2018 2:14 pm

they are inert so that they will not change the reaction but will act as electron transporters to allow the redox reaction to occur

William Satyadi 2A
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Joined: Sat Jul 22, 2017 3:00 am

Re: Cell Diagrams

Postby William Satyadi 2A » Fri Feb 23, 2018 2:17 pm

Inert electrodes like Pt are needed for some cells which don't have conducting ions. These electrodes allow for electron transfer without affecting the reaction.

Angel Gomez 1K
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Re: Cell Diagrams

Postby Angel Gomez 1K » Fri Feb 23, 2018 5:17 pm

If you notice, the inert electrodes are usually denoted as solids by (s), as most metals are solid at STP, and they have conductive properties, which is why they're useful as inert electrodes. There are exceptions, though. For ex, mercury is a liquid at STP, so it'd be written as Hg(l) in the cell diagram.

kaushalrao2H
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Re: Cell Diagrams  [ENDORSED]

Postby kaushalrao2H » Fri Feb 23, 2018 6:48 pm

electrodes have to be solid, and if none of the species in a reduction or oxidation reaction are solid (such as when two Fe species have different oxidation numbers but are both in aqueous form), then there must be an inert conductor to relay electrons.


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