Reversing the anode

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ursulavictorino1K
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Joined: Sun Feb 17, 2019 12:15 am

Reversing the anode

Postby ursulavictorino1K » Sun Mar 08, 2020 11:46 pm

Why is it that the anode reaction is always reversed when determining the cell potential?

405268063
Posts: 102
Joined: Thu Jul 25, 2019 12:17 am

Re: Reversing the anode

Postby 405268063 » Sun Mar 08, 2020 11:54 pm

The standard cell potentials are written so that each compound is gaining electrons (aka cathode reaction) so if we want the equation where electrons are actually being lost, you have to reverse that standard cell potential value.

Jesse H 2L
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Re: Reversing the anode

Postby Jesse H 2L » Sun Mar 08, 2020 11:55 pm

to get the real cell potential, we need to reverse the anode reduction reaction to make it an oxidation reaction.

SarahCoufal_1k
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Re: Reversing the anode

Postby SarahCoufal_1k » Sun Mar 08, 2020 11:57 pm

Because all cell potentials are given in the reduction form and since the anode is being oxidized you switch the equation around so it represents that. Then when. calculated Ecell you can either do Ecathode-Eanode. or Ereduction+Eoxidation but you have to reverse the sign of the oxidation one

Nawal Dandachi 1G
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Re: Reversing the anode

Postby Nawal Dandachi 1G » Sun Mar 08, 2020 11:59 pm

Because we need to show that it is being oxidized, so we flip it

Brandon Valafar
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Re: Reversing the anode

Postby Brandon Valafar » Mon Mar 09, 2020 12:21 am

Since all the cell potentials are given for reduction reactions, we have to flip the equation and the cell potential to get it for cell potential for the oxidation reaction, for the anode.

Sanjana K - 2F
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Re: Reversing the anode

Postby Sanjana K - 2F » Mon Mar 09, 2020 12:28 am

The values in the table are always standard reduction potentials, so since the anode is being oxidized and not reduced, the sign gets flipped.

WesleyWu_1C
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Re: Reversing the anode

Postby WesleyWu_1C » Mon Mar 09, 2020 12:58 am

The anode reaction is always reversed because usually when you look at the table, you get the reduction reaction the standard reduction potential. Since the anode is where oxidation occurs, you want the oxidation reaction. Therefore you would flip the reduction reaction to get the oxidation reaction, which means you would also make flip the sign of the standard reduction potential to get the standard oxidation potential.

ursulavictorino1K
Posts: 55
Joined: Sun Feb 17, 2019 12:15 am

Re: Reversing the anode

Postby ursulavictorino1K » Tue Mar 17, 2020 12:47 am

If they are always given as recutions, How do you know which to flip to an oxidizer?

Jiyoon_Hwang_2I
Posts: 101
Joined: Sat Sep 14, 2019 12:17 am

Re: Reversing the anode

Postby Jiyoon_Hwang_2I » Tue Mar 17, 2020 6:14 am

ursulavictorino1K wrote:If they are always given as recutions, How do you know which to flip to an oxidizer?


If they give you the cell potentials of each reaction, the reaction with the lower cell potential is the one that is oxidized so it will be flipped

BAlvarado_1L
Posts: 49
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Re: Reversing the anode

Postby BAlvarado_1L » Tue Mar 17, 2020 11:28 am

the anode is being oxidized so you must flip the equation since all cell potentials are given in the reduction form


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