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If enthalpy of neutralisation of a weak acid with strong base is -10.87 kacl mole then calculate enthalpy of ionisation of weak acid
$[Given : H^{+} (a q) + O H^{-} (a q) \to H_{2} O (l) Δ H = - 13.7 k c a l]$

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answer is 3.

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Detailed Solution

HA- weak acid

Given,

$\begin{array}{r} HA + {OH}^{-} ⟶ A^{-} + 1 H_{2} O Δ_{heat} H = - 10.7 \\ kcal \\ H^{+} + {OH}^{-} ⟶ H_{2} O (l) ΔH = - 13.7 kcal \end{array}$ calculate

$HA ⟶ H^{+} + A ΔH = ?$

$HA ⟶ H^{+} + A^{-} SH = - 10 .7 - (- 13 .7) = 3 Kcal$

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