Nernst Equation Calculator
Nernst equation calculator
Compute cell potential under non-standard conditions.
InputsChemistry4 fieldsLive
Result
1.07042033 V
Uses E = E0 - (RT/nF) ln Q.
Live update
Chem signal
Advanced options
Formula
E = E0 - (RT/nF) ln(Q) Symbol legend
| Symbol | Meaning | Unit | Copy |
|---|---|---|---|
E | Cell potential under given conditions | V | |
E^0 | Standard cell potential | V | |
R | Gas constant | J/(mol.K) | |
T | Temperature | K | |
n | Electrons transferred | integer | |
F | Faraday constant | C/mol | |
Q | Reaction quotient | - |
- Enter standard potential E0, electron count n, and reaction quotient Q.
- Set temperature in kelvin (default 298.15 K).
- Apply Nernst correction to obtain E.
Example
Worked example: E0=1.10 V, n=2, Q=10 at 298.15 K
- 1 E = E0 - (RT/nF)lnQ
- 2 Correction term ≈ 0.02958 V
- 3 E ≈ 1.10 - 0.02958 = 1.0704 V
Cell potential is approximately 1.0704 V.
How
- Enter E0 in volts.
- Enter electron count n and reaction quotient Q.
- Enter temperature in K and read corrected E value.
Avoid
- Using log10 form without the matching coefficient.
- Entering non-positive Q values.
- Using non-integer or zero electron count.
Ref only. Verify values. Follow lab safety.
FAQ
Can I use base-10 log in Nernst form?
Yes, but then use the corresponding 2.303RT/nF coefficient form.
What happens when Q = 1?
ln(1)=0 so E equals E0.
Why does temperature matter?
Nernst correction scales directly with absolute temperature.
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