Carboxylic Acids and Derivates

• recrystallisation method?

  • dissolve the product in the minimum amount of hot solvent
  • allow the solution to cool in order for crystals to form
  • finally, filter off the pure product under a reduced pressure
• how to further check the purity of the recrystallised product?

  measure the melting point using an oil bath, the melting point should match the data source value
• what is the purpose of the minimum water and hot water?

  to obtain a saturated solution and to ensure that crystallisation happens
• what is the purpose of filtering?


  to remove any insoluble impurities
• what is the purpose of cooling in ice?

  to increase the amount of crystals that are formed
• what is the purpose of washing the crystals with cold water?

  to remove any soluble impurities
• why is a flask left to cool before crystals were filtered off?

  because the yield is lower if its warm
• why are the crystals compressed in the funnel?

  better drying, as air passes through it not just around it