## E cell

$E_{cell} = E_{cell}^{\circ}-\frac{RT}{nF}\ln Q$

Norman Dis4C
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

### E cell

Will Ecell stays the same as the reactions go on or the value goes to 0 as it becomes equilibrium?

Veronica_Lubera_2A
Posts: 106
Joined: Sat Sep 14, 2019 12:16 am
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### Re: E cell

Ecell= E*cell- (RT/nF)lnQ. When a redox reaction is at equilibrium, DeltaG=0, Q=K, and there is no net transfer of electrons. When there is no net change in the number of electrons, Ecell=0 and then our equation turns into E*cell=(RT/nF)lnQ. So yes, Ecell will decrease to reach 0 but also keep in mind you get another equation from this too.

Norman Dis4C
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

### Re: E cell

Should it be lnK or lnQ when it reaches equilibrium or the two have the same value.

Amanda Mei 1B
Posts: 109
Joined: Sat Aug 24, 2019 12:16 am

### Re: E cell

Norman Dis4C wrote:Should it be lnK or lnQ when it reaches equilibrium or the two have the same value.

When a reaction reaches equilibrium, the reaction quotient Q (which you solve for the same way as K, but Q is for any stage of the reaction) is equal to the equilibrium constant K. So, lnK and lnQ have the same value.

Return to “Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)”

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