How to carry out a mixed-solvent recrystallization

Examptes Suppose that you have prepared a crude sample (e.g. 4.0g) of A/-phenylbenzamide (benzani-lide). Your solvent selection tests have shown that it is insoluble in water and fairly soluble in cold ethanol. The melting point of pure A/-phenylbenzamide is 158 C (Lide, 2000). Proceed as follows  

Weigh the crude sample and retain a few crystals in case seeding is required. 

Transfer the solid, using gla/ed paper or a solids funnel (p. 25), into a clean, dry conical flask (250 ml). 

Add cold ethanol (about 25 ml) and a glass rod as an anti-bumping device to the flask and then heat the mixture on a water bath until the compound has dissolved completely. 

Add cold water (about 5 ml) to the hot ethanol Solution and a slight precipitate should form, which then redissolves - this is often seen as a flash of 

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