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Question
Assertion (A): The dilution of a concentrated acid should always be done by adding water to concentrated acid with constant stirring.
Reason (R): When water is added to concentrated acid to dilute it, then a large amount of heat is evolved at once. This heat changes some of the water to steam explosively which can splash the acid on our face or clothes and cause acid burns.
Options
Both A and R are true and R is correct explanation of the assertion.
Both A and R are true but R is not the correct explanation of the assertion.
A is true but R is false.
A is false but R is true.
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Solution
A is false but R is true.
Explanation:
The assertion is false because you must always add acid to water, never water to acid. This is true because adding water to concentrated acid triggers a highly exothermic reaction that instantly turns the water into steam, causing dangerous acid spatter and burns.
