Statement 1: If 5 ml of an acid solution is completely neutralized by adding 5 ml of a base solution, the temperature of solution increases by x°C. If 20 ml of the same acid solution is completely neu

Question

Statement 1: If 5 ml of an acid solution is completely neutralized by adding 5 ml of a base solution, the temperature of solution increases by x°C. If 20 ml of the same acid solution is completely neutralized by adding 20 ml of the same base solution, the temperature of solution increases by 4x°C.

Statement 2: Heat liberated in the second case will be four times the heat liberated in the first case.

TestHub · Accepted Answer

The same solutions are used, so 20 mL + 20 mL contains four times the moles of acid and base. Therefore, the heat released is 4q (Statement 2 is correct). However, the mass of the solution heated is also four times greater, so Δ T = 4q/(4m · c) = q/(m · c) = x^°C, not 4x^°C. Thus, Statement 1 is incorrect.

The answer is (d).

Chemistry - Thermochemistry Question with Solution | TestHub

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