What is Sublimation?

It is a process where a solid directly converts into its gas phase without going into liquid state .

 

Example

Solids like Ammonium chloride, Naphthalene,Camphor and Anthracene undergo Sublimation.

When we heat them they convert directly into gases without first converting into liquid

Hence, to separate a mixture having a sublimable and non-sublimable component , we use the method of sublimation.

 

How to Separate a Mixture of Salt and Camphor?

In a mixture of Salt and Camphor,

 

Camphor 

  • Sublimes on heating
  • Hence it is a sublimable component

 

Common salt (Sodium Chloride) 

  • Does not undergo sublimation
  • It is a non sublimable component.

Procedure

  1. Take a mixture of salt and camphor in a china dish
  2. Place an inverted funnel over it
  3. Close the end of the funnel with a cotton plug
  4. Now heat the mixture

  • On heating, camphor undergoes sublimation (converts into vapours)
    These vapors solidify again on the surface of the funnel
  • However salt does not undergo sublimation and remains on the china dish
  1. Class 9
  2. Chapter 2 Class 9 - Is Matter Around Us Pure

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.