Assertion A: An aqueous solution of KOH when used for volumetric analysis, its concentration should be checked before the use. [2023]

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Solution

Q.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: An aqueous solution of KOH when used for volumetric analysis, its concentration should be checked before the use.

Reason R: On aging, KOH solution absorbs atmospheric ${CO}_{2}$ .

In the light of the above statements, choose the correct answer from the options given below: [2023]

1 (A) is correct but (R) is not correct

2 (A) is not correct but (R) is correct

3 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

4 Both (A) and (R) are correct and (R) is the correct explanation of (A)

Ans.
(4)

$KOH + {CO}_{2} \to K_{2} {CO}_{3}$

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