Recrystallisation - purifying an impure solid

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4 Terms

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Method of recrystallisation:

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How can the crystals be recovered?

  • the crystals of your compound can then be recovered by filtering once more (and washing with cold solvent to remove further filtrate if necessary)

  • the soluble impurities will pass through the filter by the crystals won’t

  • (Note that any solvent used will used to wash with must be cold to avoid redissolving the crystals and reducing the yield)

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What is the advantage of recrystallisation?

  • get a purer product

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What is the disadvantage of recrystallisation?

  • reduces % yield - due to transfer losses (lots of steps)