Le Chatelier’s principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change. This principle, also known as the equilibrium law, predicts the qualitative effect of a change in concentration, temperature, or 压力 on a chemical system at equilibrium. It guides understanding of how reversible reactions respond to external stresses.
Le Chatelier’s principle applies to systems in a state of dynamic equilibrium, where the rate of the forward reaction equals the rate of the reverse reaction, resulting in no net change in the concentrations of reactants and products. A ‘stress’ or ‘perturbation’ is any change in conditions that alters these rates, such as a change in temperature, pressure, or the concentration of a species. The principle posits that the system will respond by shifting the equilibrium position—meaning either the forward or reverse reaction will temporarily become faster than the other—to partially offset the imposed change.
For example, if a reactant is added, the system will consume more of the reactants to form products, thus ‘counteracting’ the increase. This shift continues until a new equilibrium state is established where the rates are once again equal, though the absolute concentrations of all species will be different from the initial state. It is a powerful qualitative tool for predicting the direction of a reaction’s response, but it does not provide quantitative information about the magnitude of the change or the final equilibrium concentrations. For quantitative analysis, calculations involving the reaction quotient (Q) and the equilibrium constant (K) are necessary.
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