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Question

The temperature of 5 mL of a strong acid is increased by 5C when 5 mL of a strong base is added to it. If 10 mL of each of the same solutions is mixed, the temperature should increase by:
  1. 10
  2. 15
  3. Cannot be predicted
  4. 5


Solution

The correct option is D 5
For a strong acid and a strong base, the enthalpy of neutralisation is -13.7 kcal when meq. of acid = meq of base
It means that if the number of meqv. is same the amount of energy released is the same and hence the temprature rise will be the same.
Here, in this question the concentration of acid and base is same for 5 mL solution and 10 mL solution which means the same energy will be evolved in both the cases and hence the temperature rise will be same. 

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