The principle of La Chatelier: If any one of the regulators (temperature / pressure / density of the reactant) of the reaction changes (decreases / increases) in the equilibrium of the two-way reaction, the equilibrium of the reaction changes in such a way that the result of the regulator change is mitigated. La Chatelia is basically based on two things. (1) Effect of heat: The effect of heat depends on the change of temperature ie, the reaction is either heat generating or thermal. ( i) When the reaction heat is heated, as the temperature increases, the equilibrium of the reaction goes from left to right and the amount of product increases. ( ii) When the reaction is productive, as the heat increases, the equilibrium of the reaction moves from right to left and the amount of product decreases. (2) Effect of pressure: The effect of pressure depends on the change in the number of molecules. If the value of the change in the number of molecules is zero then the pressure has no effect. And the value of the change in the number of molecules - ( i) If positive , the equilibrium of the reaction decreases with increasing pressure as the equilibrium of the reaction moves from right to left. ( ii) If the value is negative , then as the pressure increases the equilibrium of the reaction moves from left to right and the amount of product is increased.