## Calculating lnQ in Nernst Equation

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

J Medina 2I
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Joined: Wed Sep 25, 2019 12:17 am

### Calculating lnQ in Nernst Equation

In the Nernst Equation, E = Eo -(RT/nF)ln Q , for Q specifically, do we put the anode concentration at the top or the bottom? And why?

ShravanPatel2B
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Joined: Fri Aug 30, 2019 12:18 am

### Re: Calculating lnQ in Nernst Equation

It would be Reduction/Oxidation so it would be cathode/anode for ln Q

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### Re: Calculating lnQ in Nernst Equation

The anode goes on the top and the cathode goes on the bottom.The anode is thought to be the diluted concentration and the cathode is concentrated. As the reaction progresses, the concentration will increase in the left (oxidation) anode as the solid electrode dissolves, while the concentration in the right (reduction) cathode decreases as the electrode in that compartment gains mass.
In other words the concentration decreases in the cathode and increases in the anode so think of it like product (diluted) over reactant (concentrated) where the anode is the product.

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