Sublimation | Deposition | Ammonium chloride | Endothermic reaction | pH test | ammonia and HCl |

Ammonium chloride on heating directly converts into vapour. This process is called sublimation. In contrast to this, common salt is not sublime.
So from a mixture, containing ammonium chloride and common salt, ammonium chloride can be easily separated by the process of sublimation. On heating ammonium chloride converts into vapour leaving behind the non-volatile component, Salt. On cooling the vapour of ammonium chloride changes into solid.
In the process of sublimation, the compound which converts from solid to directly in the vapour is called sublimate. Hence, on heating ammonium chloride, it gets converted into white vapours. The gaseous form of ammonium chloride can be cooled easily to get a pure solid.
As we know that there are two types of reactions one is endothermic and other is exothermic based upon the amount of energy released or amount of energy consumed to form or break the new bond in formation of new compounds from the reactants.
Endothermic reactions are the one which consume energy during the reaction and the new product is formed.
Exothermic reaction is the reaction in which the energy is released in the form of heat energy where the product form will convert the wall of the vessel hot in which the reaction is carried out.
As we all know, the ammonium chloride is one of the inorganic compounds. Generally, ammonium chloride is neutral salt, but the solution of ammonium chloride is mildly acidic in nature. It has white crystalline salt, and it usually easily dissolves in water.
The reaction of ammonium chloride and water is shown below.
NH4Cl+H2O→NH4OH+HCl

When ammonium chloride dissolves in water, the absorption of heat occurs shows the reaction is an endothermic reaction. So, in the endothermic reaction, when the temperature increases, the value of the equilibrium constant also increases. Thus, the solubility of ammonium chloride increases when the temperature of the reaction increases.

Experiment performed by - Soumyaranjan Sahoo
Chemistry teacher
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