Fractional Crystallisation
| Also Known As | Recrystallisation (related), zone refining (related), crystallisation purification |
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What is Fractional Crystallisation?
A purification technique that separates mixtures of solids based on their different solubilities at various temperatures. As the solution cools, the less soluble substance crystallizes first and is collected by filtration. The process is repeated to increase purity.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A purification technique that separates mixtures of solids based on their different solubilities at various temperatures. As the solution cools, the less soluble substance crystallizes first and is collected by filtration. The process is repeated to increase purity.
Fractional crystallisation is used in: purification of organic compounds (recrystallisation), industrial separation of potassium nitrate from sodium chloride, purification of sugars, preparation of pure chemical standards, and in geological processes (magmatic differentiation — minerals crystallise …
Handling hot saturated solutions requires appropriate heat-resistant glassware (borosilicate) and protection from sudden crystallisation that can cause localised boiling. Some compounds crystallise with sharp edges that present laceration hazards when handling the solid product.