Purpose of Electrode

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805312064
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Joined: Thu Jul 11, 2019 12:16 am

Purpose of Electrode

Postby 805312064 » Fri Mar 06, 2020 8:40 am

What does the electrode do in a cell? Why do we sometimes add platinum as an electrode?

Connie Chen 1E
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Joined: Mon Jun 17, 2019 7:24 am

Re: Purpose of Electrode

Postby Connie Chen 1E » Fri Mar 06, 2020 10:08 am

The electrode is a metallic conductor that is in contact with an electrolyte solution. This allows electrons to flow between the cathode and the anode so that the reaction can proceed. Platinum is sometimes used as an electrode because in reactions that only occur with aqueous species, there is no solid that can act as a conductor for electron transfer, so using platinum, which is an inert conductor, will allow electrons to flow without altering the reaction.

Abby Soriano 1J
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Re: Purpose of Electrode

Postby Abby Soriano 1J » Fri Mar 06, 2020 10:26 am

The electrodes are what allow for the movement of electrons from one side of a galvanic cell to the other. Platinum is used as an inert conductor (it doesn't affect the reaction) when there are no conducting solids already present in the reaction.

Mariah
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Re: Purpose of Electrode

Postby Mariah » Fri Mar 06, 2020 11:11 am

Connie Chen 1E wrote:The electrode is a metallic conductor that is in contact with an electrolyte solution. This allows electrons to flow between the cathode and the anode so that the reaction can proceed. Platinum is sometimes used as an electrode because in reactions that only occur with aqueous species, there is no solid that can act as a conductor for electron transfer, so using platinum, which is an inert conductor, will allow electrons to flow without altering the reaction.


Is platinum the only inert conductor?

805312064
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Joined: Thu Jul 11, 2019 12:16 am

Re: Purpose of Electrode

Postby 805312064 » Fri Mar 06, 2020 12:25 pm

Sorry one more question! How would you write the electrode in a cell diagram?

ThomasNguyen_Dis1H
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Joined: Fri Aug 30, 2019 12:17 am

Re: Purpose of Electrode

Postby ThomasNguyen_Dis1H » Fri Mar 06, 2020 12:49 pm

The electrode allows the movement of electrons from the anode to the cathode. Since is usually a metal which is conductive, it can allow the passage of electrons to allow the half reactions to occur.

ThomasNguyen_Dis1H
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

Re: Purpose of Electrode

Postby ThomasNguyen_Dis1H » Fri Mar 06, 2020 12:49 pm

The electrode allows the movement of electrons from the anode to the cathode. Since is usually a metal which is conductive, it can allow the passage of electrons to allow the half reactions to occur.

Nicholas_Gladkov_2J
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Joined: Sat Aug 17, 2019 12:17 am

Re: Purpose of Electrode

Postby Nicholas_Gladkov_2J » Sat Mar 07, 2020 11:26 pm

805312064 wrote:Sorry one more question! How would you write the electrode in a cell diagram?


For the cell diagrams, the electrodes go on the far left (electrode for the anode) and the far right (electrode for the cathode).

faithkim1L
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Joined: Fri Aug 09, 2019 12:17 am

Re: Purpose of Electrode

Postby faithkim1L » Sun Mar 08, 2020 12:38 am

An electrode is a metallic conductor that is in the electrolyte solution. This allows electrons to flow between the two solutions. Platinum is really common for this. Graphite is also used, but not nearly as common as Platinum.

Jasmine Vallarta 2L
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Joined: Sat Aug 17, 2019 12:18 am

Re: Purpose of Electrode

Postby Jasmine Vallarta 2L » Sun Mar 08, 2020 11:02 am

The electrode is a sold metal conductor that allows e- flow in the galvanic cell. We use Pt because it is an inert metal. Some redox half rxns don't have solid metals involved (X2+ + e- --> X+), so we must add Pt to allow e- transfer from the anode to the cathode


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