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Calcimator

Electrochemistry Cell Potential

Calculate electrochemical cell potential using standard reduction potentials and the Nernst equation. Includes Gibbs free energy and equilibrium constant.

Inputs

V
V
K

Results

Standard Cell Potential (E°)

1.1 V

Cell Potential (E)

1.1 V

Nernst Correction0 V
ΔG-212.27 kJ/mol
ΔG°-212.27 kJ/mol
log₁₀(K)37.19
Spontaneous?Yes
How to Use This Calculator
  1. Enter cathode and anode reduction potentials (E°) in volts.
  2. Set temperature (K), electrons transferred (n), and product and reactant ion concentrations.
  3. Review standard cell potential, Nernst equation potential, and equilibrium constant.
  4. A positive cell potential indicates a spontaneous reaction under the given conditions.

How the result changes with Anode Reduction Potential (E°)

Anode Reduction Potential (E°)Standard Cell Potential (E°)Cell Potential (E)
-44.34 V4.34 V
-1.51.84 V1.84 V
1.5-1.16 V-1.16 V
4-3.66 V-3.66 V

What each input means

Cathode Reduction Potential (E°)
Standard reduction potential of the cathode half-reaction (e.g., Cu²⁺/Cu = +0.34 V)
Anode Reduction Potential (E°)
Standard reduction potential of the anode half-reaction (e.g., Zn²⁺/Zn = -0.76 V)
Temperature
Absolute temperature (25°C = 298.15 K)
Electrons Transferred (n)
Number of electrons transferred in the balanced redox reaction
Product Ion Concentration
Concentration of product ions for Nernst equation (Q numerator)
Reactant Ion Concentration
Concentration of reactant ions for Nernst equation (Q denominator)

How this is calculated

Formula

E = E° - (RT/nF) × ln(Q)

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Cathode Reduction Potential (E°) = 0.34, Anode Reduction Potential (E°) = -0.76, Temperature = 298.15, Electrons Transferred (n) = 2 = 6 input(s) provided
  2. Calculate Standard Cell Potential
    Standard Cell Potential
    1.1 = 1.1
  3. Calculate Cell Potential
    Cell Potential
    1.1 = 1.1
  4. Calculate Nernst Correction
    Nernst Correction
    0 = 0
  5. Calculate ΔG
    ΔG
    -212.27 = -212.27

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