Cell Potential Calculator (E°cell)

Calculate standard cell potential from reduction potentials. Determine spontaneity and relate to ΔG° and K.

🔋 E°cell = E°cathode − E°anode

E°cathode – Cathode Reduction Potential V

E°anode – Anode Reduction Potential V

⚠ Enter valid values.

Cell Potential

E°cell = E°cathode − E°anode

E°cell

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🔋 Electrochemistry Relationships

E°cell = E°cathode − E°anode

ΔG° = −nFE°cell

ln(K) = nFE° / RT

📖 Example

✅ Daniell Cell (Zn-Cu)

Cathode: Cu²⁺ + 2e⁻ → Cu, E° = +0.34 V

Anode: Zn → Zn²⁺ + 2e⁻, E°(reduction) = −0.76 V

E°cell = 0.34 − (−0.76) = 1.10 V

ΔG° = −nFE° = −2×96485×1.10 = −212 kJ

❓ FAQ

Galvanic vs Electrolytic cell?

Galvanic (voltaic): E°cell > 0, reaction is spontaneous, converts chemical → electrical energy. Electrolytic: E°cell < 0, requires external power, converts electrical → chemical energy (electroplating, electrolysis).

What is the standard hydrogen electrode?

The SHE (2H⁺ + 2e⁻ → H₂) defines E° = 0 V exactly. All other standard reduction potentials are measured relative to SHE under standard conditions (1 M, 1 atm, 25°C).

🔗 Related

Comprehensive Guide

Understanding Cell Potential: A Complete Guide

The Cell Potential Calculator is an essential analytical tool for chemistry students, educators, and laboratory professionals. Accurate Cell Potential calculations form the backbone of both theoretical studies and physical experiments. Mastering the concepts behind Cell Potential is crucial for understanding advanced chemical reactions and laboratory procedures.

Why is Cell Potential Important?

In analytical chemistry, precision is everything. Having a reliable way to compute Cell Potential saves time, prevents wasted materials, and ensures scientific accuracy.

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Speed

Instant

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Accuracy

100%

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Level

All Levels

Always verify your input units before calculating. Mismatched units (e.g., using mL instead of L) are the most common source of error when determining Cell Potential!

Common Applications

Academic Study: Verifying manual homework calculations.
Laboratory Practice: Standardizing lab reagent preparations.
Data Validation: Cross-checking experimental data analysis.

Relying solely on the calculator without understanding the underlying formula. Always review the step-by-step breakdown to internalize the mechanics.