The heat of neutralisation between a weak acid HA and a strong base NaOH is -55.9 kJ/mol. The heat of neutralisation between a strong acid and a strong base is -57.3 kJ/mol. If the weak acid is 70% io

Question

The heat of neutralisation between a weak acid HA and a strong base NaOH is -55.9 kJ/mol. The heat of neutralisation between a strong acid and a strong base is -57.3 kJ/mol. If the weak acid is 70% ionised in the solution, calculate the heat of ionisation of HA for 100% ionisation.

Answer:

2

Solution:

$- 55.9 = - 57.3 + 0.7 \times Δ H_{i o n}$ .

$Δ H_{i o n} = \frac{1.4}{0.7} = 2.0 kJ/mol$ .

Answer: 2.0 kJ/mol.

TestHub · Accepted Answer

− 55.9 = − 57.3 + 0.7 × Δ H i o n ​ . Δ H i o n ​ = 0.7 1.4 ​ = 2.0 kJ/mol . Answer: 2.0 kJ/mol.

Chemistry - Thermochemistry Question with Solution | TestHub

Doubts & Discussion