Evaporation / Crystallisation

• Evaporation - separates a soluble solid from a liquid - E.G. copper sulphate crystals can be separated from copper sulphate solution using this method.
• Evaporation

  • Involves evaporating the solution to a much smaller volume and then leaving it to cool - as solution cools, crystals of the soluble solid form.
• Evaporation - notes:

  • Water that evaporates, not the solution.
  • The slower the rate of cooling, the larger the crystals that form.
  • If all the water is evaporated, a powder forms rather than crystals.