Question

Assertion (A) : The acid must always be added to water with constant stirring.Reason (R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume. *

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Answer 1

Explanation:

it's not correct reason for it . when we add water in the acid it will be highly exothermic reaction which will be dangerous so we must add acid in the water because it's not dangerous

Answer 2

The acid must always be added to water with constant stirring because the process is highly exothermic and it can be dangerous. Therefore, the assertion is correct but the reason is incorrect.

Explanation:

• The addition of acid to water is done very carefully.
• It should be added very slowly with constant stirring.
• The process of addition of acid to water is highly exothermic, therefore, a large amount of heat is released.
• As the water is stirred, the heat generated is absorbed by the water and it becomes safer.
• Mixing an acid with water increases the concentration of $\[{H^ + }\]$ ions per unit volume. However, it has nothing to do with the addition of acid to water with constant stirring.