Why is it safe to add acid slowly into water?
Answer and explanation
Correct answer: Heat spreads through a larger volume
Diluting a concentrated acid is highly exothermic: hydration of the acid particles releases heat. Adding acid slowly to a larger volume of water allows the released heat to spread through the water and be dissipated more safely, reducing the chance of sudden boiling and dangerous splashing. Water should not be poured into concentrated acid, because a small amount of water can heat rapidly and splatter acid. Thus option A is correct.
Frequently asked questions
What is the correct answer to this question?
Heat spreads through a larger volume
Why is this the correct answer?
Diluting a concentrated acid is highly exothermic: hydration of the acid particles releases heat. Adding acid slowly to a larger volume of water allows the released heat to spread through the water and be dissipated more safely, reducing the chance of sudden boiling and dangerous splashing. Water should not be poured into concentrated acid, because a small amount of water can heat rapidly and splatter acid. Thus option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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