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Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R): Specific heat of water is quite large.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Answer
Now,
- The mixing of water to an acid is highly exothermic in nature.
- If water is added to an acid it produces a very large amount of heat. This can break the container and sometimes even causes burning as acids can heat up very quickly.
- So it is advised to add concentrated acid to water in a very slow manner.
Also,
- Specific heat capacity is the amount of heat needed to raise one gram of a material by one degree celsius.
- Specific heat of water is high as compared to other materials
Since the specific heat of water is high , it takes a lot of heat to increase its temperature. Thus, we add acid to water and not water to acid
Thus,
- Assertion is true
- Reasoning is true
- And Reasoning is the correct explanation of Assertion
So, the correct answer is (a)
