Oxidation of Alcohol

Alcohols can be oxidised to produce carboxylic acid when react with oxidising agents.
Equation:
C2H5OH + 2[O] → CH3COOH + H2O

Notes:
  1. The oxidising agent used:
    1. Acidified potassium dichromate(VI)
    2. Acidified potassium manganate (VII)
  2. Observation:
    1. For acidified potassium dichromate(VI), if oxidation occurs, the orange solution containing the dichromate(VI) ions is reduced to a green solution containing chromium(III) ions.
    2. For acidified potassium manganate (VII), the purple colour of potassium manganate (VII) decolourised.
  3. The alcohol is heated under reflux with excess oxidising agent.
  4. The reflux technique used to prevent the alcohol vapour escape to the surrounding.
  5. When the reaction is complete, the carboxylic acid is distilled off.


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