With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Separation of ammonium chloride and salt by sublimation
Ammonium chloride changes directly from solid to gaseous state on heating. So, in order to separate a mixture containing a sublimable volatile component from a non-sublimable impurity (salt in this case), the sublimation process is used.
Sublimation: It is a process in which matter undergoes a phase transition directly from a solid to gaseous form, or vapour, without passing through the more common liquid phase between the two.