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Purifying an impure solid

Description

It is often necessary to obtain a pure chemical from an impure sample. This experiment involves the purification of a chemical called alum.

Credits

:
This resource has been provided by, or developed in partnership with, Nuffield Foundation
purifying-an-impure-solid

 



Apparatus Chemicals

Eye protection

Beaker (100 cm3)

Glass stirring rod

Filter funnel

Filter papers, 2

Evaporating dish

Clamp and stand

Bunsen burner

Heat resistant mat

Tripod

Gauze

Forceps (optional)

Watch glass (optional)

Impure alum (hydrated aluminium potassium sulfate) about 5 g per group of students (Note 1)

Refer to Health & Safety and Technical notes section below for additional information.

 


 


 




It is often necessary to obtain a pure chemical from an impure sample. This experiment involves the purification of a chemical called alum.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology .