To study oxidation of alcohols using oxidizing agent
Add 0.5g of KMnO4 in a test tube and add 10mL water. Add 2-3 drops of dil H2SO4 to it
Take 3 mL of ethanol in a test tube and add two or three drops of KMnO4 solution and stir till it decoloizes. Keep on adding KMnO4 solution drop-wise & stirring till it decolorizes
Warm the mixture gently over spirit lamp and shake the reaction mixture occasionally.
Warm the solution slowly over spirit lamp till the reaction mixture decolourises (DO NOT BOIL – ethanol vapors are highly flammable )
Add a pinch of sodium hydrogen-carbonate (NaHCO3) to the solution. Check for effervescence
Observations and Findings:
Effervescence on addition of NaHCO3
Effervescence on addition of NaHCO3 confirms the presence of ethanoic acid
An oxidation process involves gain of oxygen by the elements or compounds.
Alcohol on oxidation with an oxidising agent (such as alkaline potassium permanganate solution) get oxidised to a carboxylic acid. The completion of reaction is characterized by the decolourisation of potassium permanganate solution