Question

State the kind of mixture in which the sublimation method is used.

Answer 1

Sublimation is the process of state change of substance directly from solid-state to gaseous state.

• Mixture of sublimable and non-sublimable substances can be separated using the technique called sublimation.
• The mixture of sublimable and non-sublimable substance is heated in a china dish by covering with an inverted funnel (the stem of the funnel is closed with cotton to prevent the escape of vapours)
• Then the sublimable substance turned into vapours, on the cooler sides of the funnel it gets solidified and separated.
• The non-sublimable substance remains within the china dish.
• Mixture of iodine and sand can be separated using this method where iodine is a sublimable substance.
• Examples of sublimable substances: ammonium chloride $\left({\mathrm{NH}}_4\mathrm{Cl}\right)$, camphor, iodine.