Electrolysis — Definition, Formula, Properties & Uses | AllChemicals | AllChemicals

Q: What is the formula for Electrolysis?

The formula or notation for Electrolysis is: 2H₂O → 2H₂ + O₂ (electrolysis of water, example)

Formula / Notation	2H₂O → 2H₂ + O₂ (electrolysis of water, example)
Also Known As	Electrolytic decomposition, Electrodeposition

What is Electrolysis?

The process of using electrical energy to drive a non-spontaneous chemical reaction. During electrolysis, oxidation occurs at the anode and reduction at the cathode. Applications include electroplating, production of metals (aluminum, sodium), and electrolytic refining.

Formula & Notation

2H₂O → 2H₂ + O₂ (electrolysis of water, example)

Other Names / Synonyms: Electrolytic decomposition, Electrodeposition

Properties & Characteristics

Anode (positive): oxidation occurs. Cathode (negative): reduction occurs. Quantity of product calculated by Faraday law: mass = (ItM)/(nF) where I = current (A), t = time (s), M = molar mass, n = electrons transferred, F = 96,485 C/mol. Overpotential adds to theoretical voltage required. Competing reactions possible at electrodes (e.g., O₂ evolution competing with metal deposition).

Uses & Applications

Production of aluminum (Hall-Héroult process, 960°C molten cryolite). Chlorine and NaOH (chloralkali industry — 50 million tonnes Cl₂/year). Sodium metal (Downs cell, molten NaCl). Hydrogen production (water electrolysis — key for green hydrogen). Electroplating and electroforming. Electrolytic refining of copper. Anodizing of aluminum. Electropolishing of stainless steel.

Safety Information

Electrolysis cells operate at high current — electrical hazard. Chlorine gas (toxic, IDLH = 10 ppm) and hydrogen gas (flammable, LEL = 4%) can be generated. Molten salt electrolysis operates at extreme temperatures. Wear full PPE including face shield. Ensure adequate ventilation. Emergency shutdown procedures essential for industrial cells.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Electrolysis

Formula 2H₂O → 2H₂ + O₂ (electrolysis of water, example)

Index All "E" terms

Synonyms Electrolytic decomposition, Electrodeposition

Frequently Asked Questions

What is Electrolysis?

The process of using electrical energy to drive a non-spontaneous chemical reaction. During electrolysis, oxidation occurs at the anode and reduction at the cathode. Applications include electroplating, production of metals (aluminum, sodium), and electrolytic refining.

What is Electrolysis used for?

Is Electrolysis hazardous?

What is the formula for Electrolysis?

More "E" Terms

Effective Collisions Effective Collisions E ≥ Ea (activation energy required) Effective Molality m_eff = i × m (van't Hoff factor) Effective Nuclear Charge Z_eff = Z − σ (Slater's rules) Efflorescence Hydrated salt losing water in air: M·nH₂O(s) → M·(n-x)H₂O(s) + xH₂O(g) Einsteinium Es Electrical Conductivity κ = 1/ρ; Λm = κ/c Electrochemical Cell Galvanic cell: ΔG = −nFE_cell; Electrolytic cell: ΔG = +nFE_applied Electrochemical Series Arranged by E° (standard reduction potential); SHE: E° = 0.00 V Electrochemistry E° cell = E° cathode − E° anode | ΔG° = −nFE° Electrochemistry Electrode

View all "E" terms →