Cell EMF Calculator

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Standard mode uses E-cell = E-cathode - E-anode. Nernst mode corrects for actual concentrations and temperature.
Choose a common electrode or enter a custom potential below.
Standard reduction potential of the cathode half-cell (positive electrode). For the Daniell cell copper cathode this is +0.34 V.
V
Choose a common electrode or enter a custom potential below.
Standard reduction potential of the anode half-cell (negative electrode). For the Daniell cell zinc anode this is -0.76 V.
V
Cell EMFSpontaneous
1.1V

Electromotive force of the galvanic cell

Standard EMF (E-cell)1.1V
Nernst correction0V
Gibbs free energy change-212.27kJ/mol
Reaction spontaneous?Yes - spontaneous (EMF > 0)
Equilibrium constant (K)15,479,408,344,991,101,000,000,000,000,000,000,000
1.1 V
Non-spontaneous<-0.001Equilibrium-0.001-0.001Spontaneous0.001+

Cell EMF is 1.1000 V - the reaction is spontaneous.

  • The standard cell EMF (E-cell) is 1.1000 V (cathode Cu/Cu2+ minus anode Zn/Zn2+).
  • The Gibbs free energy change under standard conditions is -212.27 kJ/mol. Negative DeltaG confirms the forward reaction is thermodynamically favored.
  • The equilibrium constant K is extremely large (1.55e+37), meaning the reaction goes nearly to completion at equilibrium.

Next stepThis cell can do useful electrical work. Check the equilibrium constant to understand how far the reaction will proceed before the voltage drops to zero.

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