## Ecell

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

### Ecell

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

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

CELL = E°(Cathode) - E°(Anode)

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

### Re: Ecell

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

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
Posts: 30
Joined: Fri Sep 28, 2018 12:22 am

### Re: Ecell

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

Ecell=Ecathode-Eanode

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

### Re: Ecell

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

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

add the potential difference of the two half-reactions

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

### Re: Ecell

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
Posts: 37
Joined: Fri Sep 28, 2018 12:22 am

### Re: Ecell

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

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

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.