12. Preparation of an ester and separation by distillation

  • 00:37 What is ‘bumping’? How do the anti-bumping granules work?
  • 00:45 Why does swirling make it safer?
  • 00:48 What is the boiling temperature of ethyl ethanoate?
  • 00:55 Why is the water-bath temperature important?
  • 01:04 What is the purpose of the gauze?
  • 01:17 Why is the location of the thermometer bulb important?
  • 01:20 What is the ‘distillate’?
  • 01:23 What is the boiling temperature of the product? Why is this important to consider at this stage?
  • 01:39 How does this temperature compare to published data?


  • 100 cm3 round-bottomed flask

  • 100 cm3 beaker

  • 100 cm3 conical flask

  • 10 cm3 measuring cylinder

  • 25 cm3 measuring cylinder

  • reflux-condenser

  • thermometer

  • specimen tube

  • labels / fine marker-pen

  • anti-bumping granules

  • warm water-bath (~50oC)

Hazard Risk Control measure

ethanol – highly flammable

Ignites due to Bunsen flame.

Clothing fire: smother flames with fire blanket. Cool burnt skin with tap water (10min).

ethanoic acid – irritant

Contact with skin & eyes.

Eye: flood with water (10min). Skin: drench with plenty of water

conc. H2SO4 solution - corrosive

Contact with skin & eyes.

Eye: flood with water (10min). See doctor. Skin: use dry cloth/paper towel to remove acid. Then drench skin with water.