Esters are sweet-smelling substances and are used in making perfumes. Suggest some activity and the reaction involved in the preparation of an ester with well-labelled diagram.

AcademicChemistryNCERTClass 10

An ester is formed when ethanol (alcohol) reacts with ethanoic acid, on heating, in the presence of a few drops of concentrated sulphuric acid by the process of esterification.
The name of the ester formed is ethyl ethanoate.
The activity for the preparation of an ester with the help of a well-labeled diagram is given below:
  1. Take 1 ml of pure ethanol (absolute alcohol) in a test-tube and add 1 ml of glacial ethanoic acid to it. Then add 2 or 3 drops of concentrated sulphuric acid to the mixture.
  2. Warm the test-tube containing above reaction mixture in a hot water bath (a beaker containing hot water) for about 5 minutes.
  3. Pour the contents of the test-tube in about 50 ml of water taken in another beaker and smell it.
  4. A sweet smell is obtained indicating the formation of an ester.

The chemical equation involved in the formation of the ester is given below:

$CH_3COOH + C_2H_5OH \xrightarrow {Conc. H_2SO_4}  CH_3COOC_2H_5 + H_2O$

Updated on 10-Oct-2022 13:29:14