Nernst Equation
| Formula / Notation | E = E° − (RT/nF)lnQ; at 25°C: E = E° − (0.0592/n)log Q |
|---|---|
| Also Known As | Nernst equation, electrode potential equation, concentration cell formula |
What is Nernst Equation?
An equation relating the electrode potential to the standard potential and the concentrations of reactants and products: E = E° - (RT/nF)ln(Q). At 25°C, this simplifies to E = E° - (0.0592/n)log(Q). Used to calculate cell potential under non-standard conditions.
Formula & Notation
Other Names / Synonyms: Nernst equation, electrode potential equation, concentration cell formula
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
An equation relating the electrode potential to the standard potential and the concentrations of reactants and products: E = E° - (RT/nF)ln(Q). At 25°C, this simplifies to E = E° - (0.0592/n)log(Q). Used to calculate cell potential under non-standard conditions.
The Nernst equation is used in: calculating electrode potentials at non-standard concentrations (e.g., pH glass electrode, ion-selective electrodes), deriving equilibrium constants from measured EMF, explaining the variation of battery voltage with state of charge, and in understanding the transmemb…
No direct safety concern for the equation. The Nernst potential at biological membranes (typically −70 mV resting potential) is disrupted by toxins that alter ion channel permeability (local anaesthetics block Na⁺ channels; tetrodotoxin, saxitoxin block voltage-gated Na⁺ channels).
The formula or notation for Nernst Equation is: E = E° − (RT/nF)lnQ; at 25°C: E = E° − (0.0592/n)log Q