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Grade 12Physical Chemistry

The heat of neutralisation of strong dibasic acid in dilute solution by NaOH is nearly

Profile image of Chandrakesh Shukla
16 Years agoGrade 12
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2 Answers

Profile image of Ramesh V
16 Years ago

The values obtained were: for  H2SO4-NaOH, is  13.48  k.cal. per gm-equiv. and 

for HCI-NaOH,  13.523  kcal.  per gm-equiv.

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regards

Ramesh

Profile image of Ashwani Dubey
7 Years ago
Valency factor of NaOH = 1
Valency factor of dibasic acid = 2
Thus only 1 gram equivalent of dibasic acid is neutralised by 1 gram equivalent of NaOH.
As we know that, for the reaction-
$$\underset{\text{acid}}{{H}^{+}} + \underset{\text{base}}{{OH}^{-}} \longrightarrow {H}_{2}O; \quad \quad \Delta{H} = -13.7 \; {KJ}/{mol}$$
Hence the heat of neutralisation of a strong dibasic acid in dilute solution by NaOH is -13.7 kcal/mol.

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