In order to study saponification reaction we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is :

exothermic and the solution is alkaline

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endothermic and the solution is alkaline

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endothermic and the solution is acidic

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exothermic and the solution is acidic

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Solution

The correct option is A exothermic and the solution is alkaline
The saponification reaction is exothermic in nature, because heat is liberated during the process. The soap formed remains in suspension form in the mixture. Sodium hydroxide is a base and its solution in water turns red litmus blue. Hence, its solution in water is alkaline.

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Similar questions

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:

(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside
(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :

Q. We need a 20% aqueous solution of sodium hydroxide for the study of saponification reaction. When we open the lid of the bottle containing solid sodium hydroxide we observe it in which form?

What happens when?

a) A solution of calcium hydroxide is added to red litmus paper

b) A solution of sodium chloride is added to red litmus paper

c) A solution of lemon juice is added to blue litmus paper

d) A solution of distilled water is added to red litmus paper

e) A solution of sodium hydroxide is added to turmeric [5 MARKS]

Q. A teacher gave two test tubes, one containing water and the other containing sodium hydroxide solution, to the students and asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for correctly identifying the test tube containing sodium hydroxide solution?

Question 12

Look at the given reaction.
Hydrochloric acid + Sodium hydroxide (base) $⟹$ Sodium chloride (salt) +Water
Sodium chloride formed this reaction remains in solution form. Can we get solid sodium chloride from the solution? Suggest a method (if any).

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