# What is the Nernst equation?

Jan 24, 2016

$E = {E}^{\circ} - \frac{R T}{n F} \ln Q$

#### Explanation:

The Nernst Equation is the relationship between the cell potential and the concentrations of the solutions at the cathode and the anode. It is given by:

$E = {E}^{\circ} - \frac{R T}{n F} \ln Q$

where, $E$ is the cell potential,
${E}^{\circ}$ is the cell potential at standard conditions,
$R$ is the universal gas constant $R = 8.3145 \frac{J}{K \cdot m o l}$
$T$ is the Kelvin temperature,
$n$ is the number of electrons exchange during the Redox reaction in the cell,
$F = 96485 \frac{C}{m o l \text{ } {e}^{-}}$ is Farady's constant,
and $Q$ is the reaction quotient.

Here is a video that explains in details the origin and use of the Nernst equation:
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Electrochemistry | The Concentration Cell.