Flipping the sign


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vanessas0123
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Joined: Wed Sep 11, 2019 12:17 am

Flipping the sign

Postby vanessas0123 » Sun Mar 01, 2020 12:43 am

When would you flip the sign in a half reaction? Do you flip the sign of the given reduction potential is the reaction is oxidation?

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

Re: Flipping the sign

Postby WesleyWu_1C » Sun Mar 01, 2020 12:56 am

Usually they give you the reduction potential for a half reaction in the table, so if you want the oxidation potential, all you do is flip the half reaction which switches the sign for E (naught).

chrisleung-2J
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Re: Flipping the sign

Postby chrisleung-2J » Sun Mar 01, 2020 1:04 am

Yes, if you are given the reduction equation and reduction potential, you would flip the equation and the sign of Eº for the oxidation equation and oxidation potential.

Nikki Razal 1L
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Re: Flipping the sign

Postby Nikki Razal 1L » Sun Mar 01, 2020 1:52 am

you flip the sign when you are given the reduction potential of a reaction but you have an oxidation reaction you are trying to find the Ecell for

Lauren Stack 1C
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Re: Flipping the sign

Postby Lauren Stack 1C » Sun Mar 01, 2020 4:13 pm

Tabled values are typically given in terms of reduction. In order to calculate the entire redox reaction value, you must flip the sign on the half reaction that is showing oxidation.

sarahsalama2E
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Re: Flipping the sign

Postby sarahsalama2E » Sun Mar 01, 2020 4:15 pm

Additionally, just wanted to add that you can think of the E cell as the reduction happening at the cathode - the reduction happening at the anode, as well as E cathode - E anode.

Callum Guo 1H
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Re: Flipping the sign

Postby Callum Guo 1H » Sun Mar 01, 2020 4:48 pm

E is usually given in reduction reactions. If you have an oxidation reaction, you flip it.

Jasmine W 1K
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Joined: Sat Sep 07, 2019 12:18 am

Re: Flipping the sign

Postby Jasmine W 1K » Sun Mar 01, 2020 4:55 pm

E is usually given for reduction reactions. When you need to find E for an oxidation reaction, you flip the sign for the equivalent reduction half-reaction.

Leyna Dang 2H
Posts: 104
Joined: Thu Jul 25, 2019 12:17 am

Re: Flipping the sign

Postby Leyna Dang 2H » Sun Mar 01, 2020 5:18 pm

E is typically given for reduction reactions. When you're expected to find the E of an oxidation reaction, you're supposed to flip the sign for the oxidation half-reaction

san_2F
Posts: 118
Joined: Sat Jul 20, 2019 12:15 am

Re: Flipping the sign

Postby san_2F » Sun Mar 01, 2020 5:19 pm

in appendix 2B, the reduction values are given, so when you need oxidation values, you have to flip the sign, but rather than E cell= E cathode- E anode, it would be E cell= E cathode + E anode.

John Liang 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:18 am

Re: Flipping the sign

Postby John Liang 2I » Sun Mar 01, 2020 5:20 pm

You flip the sign when you want to flip the rxn around. Usually you do this for the oxidized half rxn.


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