Recrystallisation
What Recrystallisation means in Chemistry A-Level, as defined for AQA, OCR.
Definitions of Recrystallisation
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Reference: AQA
Dissolve the crude solid in the minimum volume of hot solvent, filter hot to take out insoluble impurities, then cool so the product crystallises while the soluble impurities stay in solution.
Purifies a crude solid by dissolving it in the minimum volume of hot solvent, then cooling so the purified compound crystallises while impurities stay dissolved or are removed by filtration.
Dissolves the crude solid in the minimum of hot solvent and then cools it slowly to form purified crystals.
Topics that use Recrystallisation
- Acylation (A-level only) (AQA A-Level)
- Nitrogen compounds, polymers and synthesis - 6.2.5 Organic synthesis (OCR A-Level)
Related terms
- acid anhydride
- addition-elimination
- amide
- ammonium salt formation
- atom economy
- Basicity of amines
- by-product handling
- Carbonyl group distinction
Using Recrystallisation in the exam
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