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The Le Châtelier Principle Calculator allows users to predict the direction of shift of a chemical equilibrium when a reaction is subjected to an external change in concentration, pressure, or temperature. Based on the famous principle formulated by Henri Le Châtelier, the app helps to understand how chemical systems respond to counteract disturbances and restore equilibrium.
The application is designed for students, teachers, and chemistry enthusiasts who want a practical and intuitive way to qualitatively analyze the effects of various changes on reversible reactions. It is an excellent educational support for lessons, exercises, and laboratories in general or physical chemistry.
How it works
The user selects the type of disturbance applied to a system at equilibrium:
- Change in concentration – addition or removal of reactants or products;
- Change in pressure – useful in gas systems, where volume affects equilibrium;
- Change in temperature – depends on whether the reaction is exothermic or endothermic.
The calculator analyzes the disturbance and provides an immediate textual explanation of the shift in equilibrium:
The system always reacts in a way that opposes the imposed change, restoring a new equilibrium condition.
Usage examples
- Increase of a reactant → equilibrium shifts toward the products.
- Decrease of a product → equilibrium shifts toward the products.
- Increase in pressure → equilibrium shifts toward the side with fewer gas moles.
- Increase in temperature in an exothermic reaction → equilibrium shifts toward the reactants.
Why it is useful
This tool allows users to:
- Better understand the thermodynamic principles that govern chemical equilibria;
- Predict the effects of experimental variations on reversible reactions;
- Visualize abstract concepts clearly and educationally;
- Support the teaching of chemistry with interactive practical examples.
Additional tools
The result is displayed in a readable container with the option to easily copy the analysis for inclusion in reports or notes. The app offers an immediate way to apply the Le Châtelier Principle and consolidate the understanding of chemical equilibria.