Nernst Equation Calculator
Corrects a standard cell potential for real concentrations and temperature.
Cell potential E
— V
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Shift from E° — V
RT ÷ nF — V
Reading this —
The formula
E = E° − (RT ÷ nF) × ln Q
R is 8.314 J/(mol·K), F is 96,485 C/mol and T is in kelvin. At 25 °C, RT ÷ F is about 0.0257 V.
What to watch out for
When Q is 1 the logarithm is zero and E equals E°. At equilibrium E is zero.
Frequently Asked Questions
What is the potential of a 1.10 V cell with n = 2 and Q = 0.01 at 25 °C?
1.159 V.
What about the 0.0592 form of the equation?
It is the same equation at 25 °C with base-10 logs: 0.0592 ÷ n × log₁₀ Q.