Advertisements
Advertisements
प्रश्न
Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification.
उत्तर
The reaction of carboxylic acid with alcohol forms an ester. For example, ethanol reacts with ethanoic acid in the presence of an acid catalyst to give sweet smelling substance, i.e. an ester which in this case will be ethylethanoate.
CH3-COOH + CH3-CH2-OH →Acid CH3-COO-CH2-CH3 + H2O
Ethanoic acid Ethanol Ethyl ethanoate (Ester)
This reaction is known as esterification reaction.
The activity to show the formation of an ester is as follows:
1. Take 1 ml of ethanol (absolute alcohol) + 1 ml of glacial acetic acid in a boiling tube and mix the contents well.
2. Add few drops of concentrated H2SO4 to it.
3. Warm the contents on a water bath for a few minutes (at least 5 minutes).
4. Now pour the solution in a beaker containing 20-50 ml of water.
5. You will observe a sweet-fruity smell indicating the formation of an ester.
APPEARS IN
संबंधित प्रश्न
Describe in brief the cleansing action of soap.
List two problems that arise due to the use of detergents instead of soaps.
Why is common salt (sodium chloride) added during the preparation of soap?
Consider the following oils :
(I) Mobil oil
(II) Castor oil
(III) Turpentine oil
(IV) Kerosene
(V) Mustard oil
(VI) Coconut oil
Which of these can be used for prepartion of soap?
(a) I, II, III, VI
(b) II, V, VI
(c) II, III, V, VI
(d) II, III, VI
The chemical mostly used in the preparation of most of the soaps we use is
(a) Sodium chloride
(b) Potassium hydroxide
(c) Sodium hydroxide
(a) Potassium chloride
What are detergents chemically? List two merits and two demerits of using detergents for cleansing. State the reason for the suitability of detergents for washing, event in the case of water having calcium and magnesium ions.
Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.
Soap is a salt of ______ and sodium hydroxide.
______ are substances which can undergo chemical changes to produce certain materials.
- Write the formula and draw electron dot structure of carbon tetrachloride.
- What is saponification? Write the reaction involved in this process.
