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For neutralisation of HF+NaOH rarr NaF+H...

For neutralisation of `HF+NaOH rarr NaF+H_(2)O`, heat released during neutralisation is:

A

`gt13.7 kcal`

B

`lt13.7 kcal`

C

`=13.7 kcal`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
The `F^(-)` being smallest in size and thus releases more heat of hydration during neutralisation which gives higher value.
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Heat of neutralisation of HF is :

The heat released in neutralisation of HCI and NaOH is 13.7 kcal/mol, the heat released on neutralisation of NaOH with CH_(3)COOH is 3.7 kcal/mol. The Delta H^(@) of ionsiation of CH_(3)COOH is

Heat of neuralisation is amount of heat evolved or absorbed when 1g- equivalent of an acid reacts with 1g- equivalent of a base in dilute solution . If weak acid or weak bae are neutralised, the heat released during neutralisation is somewhat lesser than -13.7kcal or -57.27 kJ . Het of neutralisation is also referred as heat of formation of water from H^(+) and OH^(-) ions i.e., H^(+)+OH^(-) rarr H_(2)O, DeltaH=-13.7kcal. Heat of neutralisatio of HF and acetic acid respectively are ( in kcal):

Heat of neutralisation is least when

The heat of neutralisation is maximum when

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