In chemistry, a state of equilibrium is achieved when a reaction’s forward progress is perfectly balanced with the reverse process. Forward progress is defined as the reactants forming products and the reverse process is products changing back into the reactants.
Chemical equilibria can be altered by changes in the concentration of one of the reactants or by changes in pressure or temperature. The Chatelier’s principle is used to predict changes in conditions of a chemical equilibrium. The equilibrium law, as it is also known, states that any change in status quo prompts an opposing reaction in the responding system.