Filtration & Crystallisation (Edexcel GCSE Chemistry Combined Science): Revision Notes
📚Revision Notes
Filtration & Crystallisation
Filtration
Note
Filtration separates an insoluble solid from a liquid reaction mixture. It's often used for purification, to remove solid impurities from a liquid.
Note
Method:
Example
Example: Separating sand from a mixture of sand and water.
Crystallisation
Note
Crystallisation separates a soluble solid from a solution. It is commonly used to obtain pure crystals of a dissolved substance.
Note
Method:
Example
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. |