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Given that the data for neutralization o...

Given that the data for neutralization of a weak acid (HA) and strong acid with a strong base is:
`HA +OH^(-) rArr A^(-) + H_(2)O: DeltaH = -41.80kJ , H^(+) + OH^(-) rArr H_(2)O, Delta H= -55.90kJ`
The enthalpy of dissociation of weak acid would be

A

`-97.20kJ`

B

`+97.70kJ`

C

`-14.10kJ`

D

`14.10kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
Reaction for dissociation of weak acid is `HA rarr H^(+) + A^(-)` …(1)
Given reactions are
`HA + OH^(-) rarr A^(-) + H_(2)O` …(2)
`H^(+) + OH^(-) rarr H_(2)O` …(3)
(eq. (1) = Eq. (2) - Eq(3)
`Delta H = - 41.80 - (-55.90) = 14.10`
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