Discussion
Read the statements given below and choose the correct option :
Assertion (A) : It is recommended that acid should be added to water for diluting the acid and not vice-versa.
Reason (R) : Dilution of acid is a highly exothermic reaction.
Answer: A
Both statements are true and the Reason is the correct explanation of the Assertion.
Mixing a concentrated acid, especially sulphuric acid, with water releases a large amount of heat; the dilution is highly exothermic. If water is added to the acid, the small amount of water can boil instantly and spatter concentrated acid out of the container.
Adding the acid slowly to a large volume of water, with stirring, lets the water absorb the heat safely. The exothermic nature of dilution is exactly why the recommended order is acid into water.
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