## Endgame 2D

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

Alice Chang 2H
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

### Endgame 2D

Is anyone else having trouble calculating the concentration of Fe2+ in Endgame 2D?

I have all the right numbers for each variable (checked on the answer key), and I'm using Nernst Equation, but every time I somehow manage to calculate wrong??

Alice Chang 2H
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

### Re: Endgame 2D

Hi nevermind but leaving this here in case someone else is having trouble too.

I forgot to add a negative sign before I simplified further than lnQ.

I'm losing my mind.

MingdaH 3B
Posts: 133
Joined: Thu Jul 11, 2019 12:17 am

### Re: Endgame 2D

Maybe double check the numbers you're using again? when I do 0.15*-2*96485/(8.314*298) I get the right answer

ramiro_romero
Posts: 90
Joined: Sat Sep 07, 2019 12:16 am

### Re: Endgame 2D

MingdaH 3B wrote:Maybe double check the numbers you're using again? when I do 0.15*-2*96485/(8.314*298) I get the right answer

How? I am doing the same calculation and I keep getting lnQ= -11.6. And for the concentration of Fe 2+ I get 9.2 x 10^-6. I've gone through the problem several times and I keep getting this answer

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