SATHEE: Chemical Thermodynamics Question 414

Chemical Thermodynamics Question 414

Question: The enthalpy of neutralisation of a weak acid in 1 M solution with a strong base is $- 56.1 k c a l m o l^{- 1} .$ If the enthalpy of ionisation of acid is $1.5 k c a l m o l^{- 1}$ and enthalpy of neutralisation of the strong acid with a strong base is $- 57.3 k J e q^{- 1}$ . What is the % ionisation of the weak acid in molar solution (assume the acid is monobasic)

Options:

A) 25

B) 20

C) 15

D) 10

Show Answer

Answer:

Correct Answer: B

Solution:

The enthalpy of ionisation of weak acid is given by $Δ H_{i o n} (H A)$

$= Δ H_{N}$ (weak acid / strong base) - $Δ H_{N}$ (strong acid / strong base) $= - 56.1 - (- 57.3) = 1.2 k J, m o l^{- 1}$

$Δ H_{(i o n i s a t i o n)} = 1.5, k J m o l^{- 1}$

Hence % ionisation in 1 M solution $= \frac{(1.5 - 1.2)}{1.5} \times 100 = 20$ %

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Chemical Thermodynamics Question 414

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