Filtration & Crystallisation (Edexcel GCSE Chemistry): Revision Notes
📚 Revision Notes
Filtration & Crystallisation
Filtration
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Filtration separates an insoluble solid from a liquid reaction mixture. It's often used for purification, to remove solid impurities from a liquid.
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Method:
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Example: Separating sand from a mixture of sand and water.
Crystallisation
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Crystallisation separates a soluble solid from a solution. It is commonly used to obtain pure crystals of a dissolved substance.
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Method:
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Example: Separating salt from saltwater.
Comparison of Filtration and Crystallisation:
| Process | Separates | Examples | Method Summary |
|---|---|---|---|
| Filtration | Insoluble solid from liquid | Sand from water | Pour through philtre paper, solid stays, liquid passes through. |
| Crystallisation | Soluble solid from solution | Salt from saltwater | Heat solution, form crystals, philtre and dry crystals. |