BRAINCAKEFiltration under Reduced Pressure
Filtration under reduced pressure (also called vacuum or suction filtration) separates a solid from a liquid much faster than gravity filtration, and leaves the solid drier. It is used to collect a crude organic solid and, after recrystallisation, the purified crystals.
The apparatus is a Büchner funnel (or a smaller Hirsch funnel) sitting in a Büchner flask, a thick-walled conical flask with a side arm. The side arm is connected by tubing to a vacuum pump or water aspirator:
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All 9 lessons in Organic Synthesis · All OCR A-level Organic Chemistry topics