# Varying the concentrations of half-cells

1. Jun 18, 2005

### ~angel~

I'm not sure ow to do this question.

Calculate the reduction potential of a half-cell consisting of a platinum electrode immersed in a 2.0M Fe2+ and 0.2M Fe3+ solution 25c.

Thanks.

2. Jun 19, 2005

### Dr.Brain

The Nernst Equation is given by:

$E= E_o - \frac{0.059}{n} log \frac{N_1}{N_2}$

The above half cell reaction can be written as:

$Fe^2^+ ------> Fe^3^+ e^_$

here n=1 as you can see in the cell reaction.