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. Two-Solvent Recrystallization Guide
Overview:
For a two-solvent recrystallization, you should have one solvent (solvent #1) in which your
pound is soluble at the boiling point. The second solvent (solvent #2) should induce
crystallization when added to a saturated solution of pound in the primary solvent.
Reference:
See Zubrick pages 114–117.
Recrystallization Steps:
1) The first step is to remove insoluble material from pound by filtration.
2) Transfer the material to a 50-mL Erlenmeyer flask, equipped with a stir bar. Add an
excess amount of solvent #1 (about 20 mL in experiment ) and heat to boiling on a
stir/hot plate. The excess solvent is used to keep pound from precipitating during
the filtration.
3) Filter off any insoluble contaminants through fluted filter paper in a pre-warmed
stemless funnel (pre-warm by adding some hot solvent just before you filter the