Ecell

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FrankieClarke2C
Posts: 59
Joined: Fri Sep 28, 2018 12:28 am

Ecell

Postby FrankieClarke2C » Sun Feb 24, 2019 4:56 pm

How is Ecell calculated just by looking at the half reactions?

Mahir_Hasan2C
Posts: 60
Joined: Fri Sep 28, 2018 12:25 am

Re: Ecell

Postby Mahir_Hasan2C » Sun Feb 24, 2019 5:22 pm

You would add the potential difference of the two half-reactions, keeping in mind that you may flip one-half reaction to cancel out the electrons.

Edward Xie 2E
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Ecell

Postby Edward Xie 2E » Sun Feb 24, 2019 5:28 pm

CELL = E°(Cathode) - E°(Anode)

RachelCheung1A
Posts: 30
Joined: Fri Sep 28, 2018 12:19 am

Re: Ecell

Postby RachelCheung1A » Sun Feb 24, 2019 6:51 pm

Ecell can be calculated by subtracting the reduction potential of the half reaction that is oxidized from the reduction potential of the half reaction that is reduced.

Jack Hewitt 2H
Posts: 67
Joined: Fri Sep 28, 2018 12:27 am

Re: Ecell

Postby Jack Hewitt 2H » Tue Mar 05, 2019 2:29 pm

Ecell is calculated by subtracting the reduction potential of the oxidized half reaction (Anode) from the reduction potential of the reduced half reaction (Cathode).

Gillian Murphy 2C
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Joined: Fri Sep 28, 2018 12:22 am

Re: Ecell

Postby Gillian Murphy 2C » Tue Mar 05, 2019 3:05 pm

When you do that, make sure you don't negate the E value because that would change it into the standard oxidizing potential. Use the E values exactly as they are given

Samantha Chang 2K
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Ecell

Postby Samantha Chang 2K » Tue Mar 05, 2019 8:59 pm

Ecell=Ecathode-Eanode

Karishma_1G
Posts: 67
Joined: Fri Sep 28, 2018 12:18 am

Re: Ecell

Postby Karishma_1G » Tue Mar 05, 2019 11:55 pm

You have to find the two half-reactions in the standard potentials table. Then you would use the formula E(cell) = E(cathode) - E(anode). The cathode is the site of reduction and the anode is the site of oxidation.

sonalivij
Posts: 70
Joined: Fri Sep 28, 2018 12:27 am

Re: Ecell

Postby sonalivij » Wed Mar 06, 2019 2:31 pm

Remember, Ecell is different than the standard potential - Ecell is calculated using standard potentials, E knot

Jeremiah Hutauruk
Posts: 67
Joined: Fri Sep 28, 2018 12:28 am

Re: Ecell

Postby Jeremiah Hutauruk » Wed Mar 06, 2019 4:07 pm

add the potential difference of the two half-reactions

Felicia1E
Posts: 31
Joined: Fri Sep 28, 2018 12:22 am

Re: Ecell

Postby Felicia1E » Thu Mar 07, 2019 1:04 am

As Dr. Lavelle stated in lecture, if you don't want to remember the equation of cathode - anode, just make sure you write the reduction half reaction and find the E°, then write the oxidation held reaction and find the E°, making sure that when you look at the standard reduction tables to find the flipped version of the oxidation reaction and change the sign of the E° value given in the table. Then add the two values together to find the E°cell. The units should be volts (V).

Calvin Patel 2H
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Joined: Fri Sep 28, 2018 12:22 am

Re: Ecell

Postby Calvin Patel 2H » Thu Mar 07, 2019 11:47 am

Use the reduction potential of the Cathode and the Anode.

Zubair Ahmed 1L
Posts: 81
Joined: Fri Sep 28, 2018 12:16 am

Re: Ecell

Postby Zubair Ahmed 1L » Thu Mar 07, 2019 11:56 am

in order to calculate the Ecell of a system, you must use the standard reduction potentials and the formula Ecell=cathode-anode.

Cynthia Ulloa
Posts: 52
Joined: Fri Feb 23, 2018 3:02 am

Re: Ecell

Postby Cynthia Ulloa » Thu Mar 07, 2019 12:08 pm

Use Ecell= Eº(cathode) - Eº(anode) and you might have to flip one of the equations. I believe the professor will provide us with the sheet that has the E values for each half reaction so you would just plug in accordingly.


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