3 mL of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.(i) How is 5% solution of KMnO4 prepared ?(ii) State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess ?(iii) Write chemical equation of this reaction.

3 mL of ethanol is taken in a test tube and warmed gently in a water b

1.	3 mL of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.(i) How is 5% solution of KMnO4 prepared ?(ii) State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess ?(iii) Write chemical equation of this reaction.
Answer» Solution :(i) 5% solution of `KMnO_4` is OBTAINED by dissolving 5 g of solid `KMnO_4` in 100 mL of water. (ii) Alkaline potassium PERMANGANATE acts as an oxidising agent. Pink colour of `KMnO_4` is discharged and ethanoic acid is formed. (iii) `CH_3CH_2OH overset("Alkaline "KMnO_4)underset(HEAT)rarrunderset("Ethanoic acid")(CH_3COOH)`