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Le Chatelier's Principle

Quick Reference
Also Known AsLe Chatelier principle, Equilibrium shift principle

What is Le Chatelier's Principle?

The principle stating that if a system at equilibrium is disturbed by a change in conditions (concentration, pressure, or temperature), the system will shift to partially counteract the disturbance and establish a new equilibrium. Used to predict how equilibria respond to changes.

Properties & Characteristics

Three types of disturbances shift equilibrium: (1) Concentration change — adding reactant shifts right; adding product shifts left. (2) Pressure change (gases only) — increased pressure shifts toward fewer moles of gas. (3) Temperature change — for exothermic reactions, increasing T shifts left (decreases K); for endothermic reactions, increasing T shifts right (increases K). Catalysts DO NOT shift equilibrium — only change rate of reaching it.

Uses & Applications

Industrial process optimization (Haber process: high pressure favors NH₃ production). Contact process for H₂SO₄ (temperature and pressure optimization). Predicting blood chemistry responses to CO₂/O₂ changes. Designing pH buffers. Solubility prediction in analytical chemistry. Predicting effects of environmental changes on aquatic chemistry.

Safety Information

Understanding Le Chatelier's principle helps predict what happens when conditions change unexpectedly in industrial processes — critical for preventing runaway reactions or dangerous pressure buildup.

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

Key Facts

Term Le Chatelier's Principle
Synonyms Le Chatelier principle, Equilibrium shift principle

Frequently Asked Questions

The principle stating that if a system at equilibrium is disturbed by a change in conditions (concentration, pressure, or temperature), the system will shift to partially counteract the disturbance and establish a new equilibrium. Used to predict how equilibria respond to changes.

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