Galvanic Cell Calculator

A galvanic cell is a battery-like device that generates electricity from a spontaneous chemical reaction between two electrodes — this Galvanic Cell Calculator tells you how much voltage it produces under any conditions. Enter the anode and cathode standard potentials, along with temperature, electrons transferred (n), and reaction quotient (Q) to calculate the Cell Potential (Ecell) via the Nernst equation. Secondary outputs include the Standard Cell Potential (E°cell), Nernst Correction, and Reaction Feasibility.

V

Standard reduction potential of the anode (becomes oxidation potential)

V

Standard reduction potential of the cathode

K

Temperature in Kelvin (298.15 K = 25°C)

Number of electrons transferred in the balanced equation

Q = [products]/[reactants] at non-standard conditions

Results

Cell Potential (Ecell)

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Standard Cell Potential (E°cell)

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Nernst Correction

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Reaction Feasibility

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Frequently Asked Questions

What is a galvanic cell and how does it work?

A galvanic cell is an electrochemical cell that generates electrical energy from spontaneous chemical reactions. It consists of two electrodes (anode and cathode) connected by a salt bridge, where oxidation occurs at the anode and reduction at the cathode.

How do I determine which electrode is the anode and cathode?

The electrode with the lower standard reduction potential becomes the anode (oxidation site), while the electrode with the higher standard reduction potential becomes the cathode (reduction site). The anode potential is reversed in sign when calculating cell potential.

What is the Nernst equation and when should I use it?

The Nernst equation calculates cell potential at non-standard conditions: E = E° - (RT/nF)lnQ. Use it when temperature is not 25°C or when ion concentrations differ from 1 M standard conditions.

How do I calculate the reaction quotient (Q)?

Q is the ratio of product concentrations to reactant concentrations, each raised to their stoichiometric coefficients: Q = [products]^coefficients / [reactants]^coefficients. For standard conditions, Q = 1.

What does a positive vs negative cell potential mean?

A positive cell potential indicates a spontaneous reaction that can generate electrical energy. A negative cell potential means the reaction is non-spontaneous and requires external energy to proceed.

How does temperature affect cell potential?

Temperature affects cell potential through the Nernst equation. Higher temperatures generally decrease cell potential for most galvanic cells, while lower temperatures increase it.

Can I use this calculator for concentration cells?

Yes, for concentration cells with identical electrodes but different concentrations, set both standard potentials to the same value and adjust the reaction quotient to reflect the concentration difference.