Monday, November 7, 2011

Chemistry Form 5: Chapter 2 - Dehydration of Alcohol


  • In the dehydration of alcohols, a molecule of water is eliminated from each alcohol molecule to produce alkene.
  • There are two methods of dehydration:
a)      Ethanol vapour is passed over a heated unglazed porcelain chips, porous pot, pumice stone or alumina (aluminium oxide).
b)      Ethanol is heated under reflux at 170 °C with excess concentrated sulphuric acid.
School Laboratory Experiment

  • Alkene can be tested by decolourising brown bromine water or decolourising purple acidified potassium manganate (VII) solution.

1 comment:

dehydration said...

This "dehydration" issue, interesting to me..