Cell Potential Calculator
Calculate standard cell potential: E_cell = E_cathode - E_anode.
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Enter the standard reduction potential for the cathode (where reduction happens) and the anode (where oxidation happens). Both values should be standard reduction potentials. The calculator subtracts anode from cathode.
About the Cell Potential Calculator
The standard cell potential determines whether an electrochemical cell is spontaneous (galvanic) or requires external energy (electrolytic). It is calculated from the difference of standard reduction potentials of the two half-cells. This fundamental quantity connects to Gibbs free energy through delta G = -nFE.
Frequently Asked Questions
How do I determine cathode and anode?
The cathode is where reduction occurs (higher reduction potential). The anode is where oxidation occurs (lower reduction potential). Always use standard reduction potentials for both, then subtract: E°cell = E°cathode - E°anode.
What does a positive E°cell mean?
A positive E°cell means the reaction is spontaneous as written (galvanic cell). The cell can produce electrical energy. A negative E°cell means you need to supply energy (electrolytic cell).
Where do I find standard reduction potentials?
Standard reduction potentials are tabulated in electrochemistry reference tables. Common values: Cu2+/Cu = +0.34 V, Zn2+/Zn = -0.76 V, Ag+/Ag = +0.80 V, Fe2+/Fe = -0.44 V.