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Purifying an impure solid
In association with Nuffield Foundation
Source: © Shutterstock
Purify alum as an example of obtaining a pure chemical from an impure sample in this class practical. Includes kit list and safety instructions.
It is often necessary to obtain pure solid chemicals from impure substances. In this experiment, students use filtration and evaporation to purify alum, with the opportunity to grow large crystals of the pure chemical.
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