The diethyl ether phase was removed from the funnel into a conical flask (100ml), rinsing the funnel with more diethyl ether (5ml). Two large spatula-tip loads of anhydrous sodium sulphate was added and shaken in for a few minutes to dry the mixture...
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It was then transferred to a pre-weighed B14 round flask (100ml) after 2 washes with some diethyl ether (5ml), with all of the sodium sulphate left behind. The diethyl ether was then removed on a rotary evaporator, weighed and, its m.p. was determined.
Recrystallisation ? benzimidazole and benzoic acid
The dried benzimidazole was transferred into a conical flask (25ml), into which were also added anti-bumping granules (2) and water (10ml)...