Electrochemistry Cell Potential Calculator

Compute standard and non-standard cell potential, Gibbs free energy, and equilibrium constant from common half-reactions.

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What This Calculator Does

This calculator combines two standard half-reactions into a galvanic-cell estimate, then applies the Nernst equation to account for simple concentration changes away from standard state.

It combines Cathode Half-Reaction, Anode Half-Reaction, Cathode Ion Activity, Anode Ion Activity to estimate Standard Cell Potential, Non-Standard Cell Potential, ΔG°.

Formula & Method

Core equations: E^circ_{cell}=E^circ_{cathode}-E^circ_{anode}, Delta G^circ=-nFE^circ, K=expleft(rac{nFE^circ}{RT} ight), and E=E^circ-rac{RT}{nF}ln Q.

Notation used in the formulas: R = Standard Cell Potential; x_{1} = Cathode Half-Reaction; x_{2} = Anode Half-Reaction; x_{3} = Cathode Ion Activity; x_{4} = Anode Ion Activity; x_{5} = Temperature.

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use it when comparing likely galvanic cells or estimating how concentration changes shift the observed voltage.

Inputs Used

Cathode Half-Reaction: Used directly in the calculation.
Anode Half-Reaction: Used directly in the calculation.
Cathode Ion Activity: Used directly in the calculation.
Anode Ion Activity: Used directly in the calculation.
Temperature: Used directly in the calculation.

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