Q1
Salt can be recovered from saltwater by:
Aevaporation
Bsieving
Chandpicking
Dwinnowing
CBSEClass 6 (CBSE)ScienceCh 9 · Topic 3
Separation by Evaporation and Condensation
Learning how evaporation and condensation are used to separate mixtures.
Core concept
Distillation is especially useful when we want to recover BOTH components of a mixture in pure form, unlike simple evaporation which only leaves behind the solid while the liquid escapes into the air unused. This principle is used on a large scale to convert seawater into fresh drinking water in regions with water scarcity, and is also used to purify substances in chemical laboratories and industries, including in the production of items like perfumes and alcoholic beverages.
Exam highlight
Key diagram
- Show a diagram of saltwater being heated, water evaporating, and salt remaining.
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Quick notes
• Heating saltwater evaporates the water, leaving the dissolved salt behind.
• Cooling water vapour causes it to condense back into liquid water.
• Distillation combines evaporation and condensation to recover both components of a mixture.
• Large-scale distillation is used to convert seawater into fresh drinking water.