What happens to the temperature of the solution when acid is mixed with water?
Answer and explanation
Correct answer: Temperature increases
The governing concept is exothermic dilution. When an acid dissolves and its particles become hydrated in water, heat is released; consequently, the temperature of the solution generally increases. Thus option B is correct. The temperature does not necessarily fall to zero or remain unchanged. Because rapid heat production can cause splashing, the safe laboratory rule is to add acid slowly to water with stirring, never to pour water quickly into concentrated acid.
Frequently asked questions
What is the correct answer to this question?
Temperature increases
Why is this the correct answer?
The governing concept is exothermic dilution. When an acid dissolves and its particles become hydrated in water, heat is released; consequently, the temperature of the solution generally increases. Thus option B is correct. The temperature does not necessarily fall to zero or remain unchanged. Because rapid heat production can cause splashing, the safe laboratory rule is to add acid slowly to water with stirring, never to pour water quickly into concentrated acid.
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.
