## Cell Concentration

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

Moderators: Chem_Mod, Chem_Admin

Abigail Volk 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

### Cell Concentration

On one of the bullet points on the electrochemistry outline says "understand how a concentration cell works and give an example." What is an example of cell concentration, or what is Lavelle looking for when answering this?

Ryan Sydney Beyer 2B
Posts: 82
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

### Re: Cell Concentration

I think Dr. Lavelle is talking about a cell that runs on the concentration difference between two chambers of the cell. He went over examples of these during lecture - different from a galvanic cell b/c doesn't depend on the oxidizing power / reducing power but instead on the conc. difference between two species.

Samantha Joseph 1F
Posts: 48
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

### Re: Cell Concentration

I think you just have to understand it conceptually, like how a concentration cell can be treated like a battery that gains voltage by transferring electrons from the lower concentrated cell to the higher concentrated cell. I think it's also supposed to be an example for application of the Nernst equation.

Rachel Wang
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

### Re: Cell Concentration

A concentration cell has the same electrode/element for both half cells BUT with different concentrations.

All concentration cells have E(nought) = 0.

Use the Nernst equation
E = Eo - 0.05916 V/n x log Q
or
E = 0 - 0.05916 V/n x log Q. You get Q from the overall redox rxn, which usually has the smaller Molarity on the product side.

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

### Who is online

Users browsing this forum: No registered users and 1 guest