Page 1 of 1

Ecell

Posted: Sun Feb 24, 2019 4:56 pm
by FrankieClarke2C
How is Ecell calculated just by looking at the half reactions?

Re: Ecell

Posted: Sun Feb 24, 2019 5:22 pm
by Mahir_Hasan2C
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.

Re: Ecell

Posted: Sun Feb 24, 2019 5:28 pm
by Edward Xie 2E
CELL = E°(Cathode) - E°(Anode)

Re: Ecell

Posted: Sun Feb 24, 2019 6:51 pm
by RachelCheung1A
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.

Re: Ecell

Posted: Tue Mar 05, 2019 2:29 pm
by Jack Hewitt 2H
Ecell is calculated by subtracting the reduction potential of the oxidized half reaction (Anode) from the reduction potential of the reduced half reaction (Cathode).

Re: Ecell

Posted: Tue Mar 05, 2019 3:05 pm
by Gillian Murphy 2C
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

Re: Ecell

Posted: Tue Mar 05, 2019 8:59 pm
by Samantha Chang 2K
Ecell=Ecathode-Eanode

Re: Ecell

Posted: Tue Mar 05, 2019 11:55 pm
by Karishma_1G
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.

Re: Ecell

Posted: Wed Mar 06, 2019 2:31 pm
by sonalivij
Remember, Ecell is different than the standard potential - Ecell is calculated using standard potentials, E knot

Re: Ecell

Posted: Wed Mar 06, 2019 4:07 pm
by Jeremiah Hutauruk
add the potential difference of the two half-reactions

Re: Ecell

Posted: Thu Mar 07, 2019 1:04 am
by Felicia1E
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).

Re: Ecell

Posted: Thu Mar 07, 2019 11:47 am
by Calvin Patel 2H
Use the reduction potential of the Cathode and the Anode.

Re: Ecell

Posted: Thu Mar 07, 2019 11:56 am
by Zubair Ahmed 1L
in order to calculate the Ecell of a system, you must use the standard reduction potentials and the formula Ecell=cathode-anode.

Re: Ecell

Posted: Thu Mar 07, 2019 12:08 pm
by Cynthia Ulloa
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.