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Practise purifying an impure solid by recrystallisation, adding a minimum volume of solvent and applying gentle heat to fully dissolve the sample, then cooling the solution to obtain pure crystals.

Learning Outcomes

  • Familiarise yourself with the basic principles of purifying an impure solid by recrystallisation
  • Learn how to add a minimum volume of solvent and apply gentle heat to fully dissolve the sample, then cool the solution to obtain pure crystals  
  • Understand the effects of adding too much or too little solvent
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Using Instruments and Equipment

  • How to apply the right amount of solvent and heat to fully dissolve the sample
  • How to cool the solution to crystallise the purified material 

Working in a Safe Manner

  • Why you should add solvent before applying heat to the glassware 

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Dr. Aga Kosinska
CLIE, University College London

“International students found it much easier to learn new techniques using the simulations and were more confident when they got to the lab. The enhanced pre-labs resulted in students engaging with the lab manual to a greater extent than ever before.”



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