Nernst Equation Calculator
Use E = E° − (RT/zF) ln Q for a supplied dimensionless reaction quotient.
Q is the reaction quotient for the balanced electrochemical reaction, expressed using thermodynamic activities (or a suitable dimensionless approximation). This tool accepts Q as given and does not derive it from species or concentrations.
E = E° − (RT/zF) ln Q
Potential E (V)
Sources: IUPAC Gold Book — Nernst equation
A QUICK WALKTHROUGH
How to use this tool
- Enter standard potential E° in volts and temperature T in kelvin.
- Enter positive integer electron number z and dimensionless Q greater than zero.
- Calculate the equilibrium potential E.
Equation and inputs
Q is the reaction quotient for the balanced electrochemical reaction, expressed using thermodynamic activities (or a suitable dimensionless approximation). This tool accepts Q as given and does not derive it from species or concentrations.
GOOD TO KNOW
Common questions
Can this calculate Q from a reaction or concentrations?
No. Supply the dimensionless reaction quotient for the chosen balanced reaction. Activities, standard states, and the reaction direction determine Q and the sign convention.