Chemistry
Advanced

Nernst Equation

Cell potential under non-standard conditions.

Formula

E=E∘−RTnFln⁡QE = E^\circ - \frac{RT}{nF}\ln Q

Variables

E^\circStandard potential
nElectrons
FFaraday
QReaction quotient

Example

As reactant concentrations fall, a battery’s voltage drops below its standard value.

Did You Know?

The Nernst equation predicts battery voltage and the electrical signals firing in your neurons.

electrochemistrynernstcell