Question

3 ml of Ethanol is taken in a test tube and warm gently in a water bath a 5% solution of Alkaline potassium per magnet is it first drop by drop to the solution then 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 for this reaction ​

Answer 1

Explanation:

(i) by adding water in KMNO4 solution

(ii) oxidising agent - it will add oxygen in the ethanol to form ethanoic acid

(iii) C2H5OH (Alk.KMO4) ------------> CH3COOH

Answer 2

All the questions are answered below.

Explanation:

• Potassium permanganate is a strong oxidising agent.

• It can oxidize alcohols to directly carboxylic acids.

• The alkaline potassium permanganate is also called as Bayer's reagent.

• This reagent when added drop by drop, reacts with ethanol to convert it into ethanoic acid and manganese dioxide.

• So the colour of the solution vanishes.

• Now as it's added in excess, the end point is marked by the return of the colour of permanganate ion.

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