Question

Explain how evaporation is used to separate mixtures.

Answer 1

Definition of evaporation.

Evaporation is the process by which a liquid is changed into its vapour state.

• This method is used to separate a solid that is soluble in a liquid.
• The method involves heating the mixture until the liquid evaporates completely, leaving behind the solid residue.
• This method is used in the production of sea salt from seawater.
• Sea water is collected in shallow ditches and allowed to evaporate by sunlight. When all the water gets evaporated, salt is left behind.
• Evaporation is also used to obtain milk powder by evaporating the water present in the milk.