Question

the heat of neutralization of a week acid (HX) and strong base (MOH) is -11.2kcal/mol .then the heat of dissociation of weak acid is

Answer 1

The heat of neutralization of a week acid (HX) and strong base (MOH) is -11.2kcal/mol .then the heat of dissociation of weak acid is 2.5 kcal/mole

Explanation:

Heat of formation of water is 13.7 kcal

Thus,

$H_2O\rightarrow H^++OH^-$      $\Delta H=13.7$ kcal/mole

Given that heat of neutralisation of HX by strong base MOH is -11.2 kcal/mole

Therefore,

$HX+OH^-\rightarrow X^-+H_2O$     $\Delta H=-11.2$ kcal/mole

Adding both the equations

$HX\rightarrow H^++OH^-$     $\Delta H=13.7-11.2=2.5$ kcal/mole

Therefore, the heat of dissociation of weak acid is 2.5 kcal/mole

Hope this answer is helpful.

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