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GCSE Combined Science · key term
The formation of solid crystals from a solution.
Used by AQA and Edexcel
Specification 5.1.1.2, 5.4.2.3 · Paper 3
Obtaining a dissolved solid as crystals from a solution.
Revise: Separation of MixturesCrystallisation obtains a soluble solid from its solution. The liquid that does the dissolving is the solvent, and the dissolved substance is the solute. In copper sulfate solution, water is the solvent and copper sulfate is the solute.
Specification Methods of separating and purifying substances, Acids · Paper 3, Paper 4
Separation of a dissolved solid from a solution by forming and collecting crystals.
Revise: Purity and choosing separation methodsCrystallisation is used to obtain a dissolved solid from its solution. Copper sulfate solution is a useful example because copper sulfate is more soluble in hot water than in cold water.
The formation of solid crystals from a solution, for example as water evaporates or a concentrated solution cools.
For salt solution, choose crystallisation to collect the salt and simple distillation to collect the water.
Dry hydrated crystals have no liquid water on their surface but still contain water of crystallisation. Do not heat them strongly to remove this water.
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