Filtration under reduced pressure
What Filtration under reduced pressure means in Chemistry A-Level, as defined for OCR.
Definitions of Filtration under reduced pressure
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Reference: OCR
Separates a solid from a liquid quickly by pulling air out of the receiving flask with a water pump or vacuum line, so liquid is drawn through faster than under gravity.
A Buchner funnel fitted with a flat filter paper sits on a Buchner flask connected to a suction pump, which pulls liquid through quickly.
The crystals are filtered off under reduced pressure using a Buchner funnel, washed with a small volume of cold solvent and dried.
Separates the crystals from the mother liquor, and washing with cold solvent removes soluble impurities.
Topics that use Filtration under reduced pressure
- Nitrogen compounds, polymers and synthesis - 6.2.5 Organic synthesis (OCR A-Level)
- Use of apparatus and techniques (OCR A-Level)
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