Concept 6 of 8Foundation
Watch on YouTubeVideoEvaporation and crystallization
Evaporation: heat the solution until the liquid turns into vapour, leaving behind the dissolved solid.
Used in sea-salt production: sea water is collected in shallow pans; Sun evaporates the water, leaving salt crystals.
Crystallization: cool a saturated solution slowly → solid forms pure crystals. Better purity than plain evaporation.
Example
A glass of sugar water left in sunlight — water evaporates and sugar crystals reappear at the bottom.
💡 Tip:Evaporation works for soluble solids. Insoluble ones (like sand) need filtration first.
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5 questions to check what you just read.
0 / 5
- Q1.Salt from sea water is obtained by:
- Q2.Crystallization gives:
- Q3.Evaporation speeds up with:
- Q4.Sugar from sugar solution:
- Q5.Main difference: evaporation vs boiling: