Le Chatelier’s principle





In order to study the effect of change in temperature, pressure or concentration on the state of equilibrium Le Chatelier and Braunna (1884) enunciated a general principle which is known as Le Chate1ier’s principle.

According to this principle, “if a system in equilibrium is subjected to a change in concentration, temperature or pressure, then the equilibrium automatically shifts in such a way that the effect of the changed condition is nullified”.

According to this principle we may conclude that:

(i)       The increase of temperature will favour the reaction in the direction in which heat is absorbed, i. e., endothermic reaction.

 

(ii)      The increase of pressure shifts the system in the direction in which there is a decrease in volume.

 

(iii)      The increase in concentration of the reactant or decrease in concentration of the product will shift the reaction in a direction where the added concentration is consumed.



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