Question

Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures:

One of the components changes directly from solid to gaseous state.

Answer 1

Sublimation:-

1. The process where a solid is converted directly into a gas is called sublimation.
2. For example, ammonium chloride ${\mathrm{NH}}_4\mathrm{Cl}$ is a sublimate and is separated from potassium chloride $\mathrm{KCl}$ by the help of sublimation.
3. The mixture of ammonium chloride ${\mathrm{NH}}_4\mathrm{Cl}$ and potassium chloride $\mathrm{KCl}$ is heated.
4. The ammonium chloride gets converted from sublimate to vapour directly, and hence the potassium chloride solution is left behind in the dish.

Therefore, a mixture of ammonium chloride ${\mathrm{NH}}_4\mathrm{Cl}$ and potassium chloride $\mathrm{KCl}$ is separated with the help of the sublimation process.