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In chemistry, Le Chatelier's principle, also called the Le Chatelier-Braun principle, can be used to predict the effect of a change in conditions on a chemical equilibrium. Changing the concentration of an ingredient will shift the equilibrium to the side that would reduce that change in concentration. The principle is used by chemists in order to manipulate the outcomes of reversible reactions, often to increase the yield of reactions. Click the buttons in animation to view changes..