What is the heat of neutralisation of HCN by a strong base? Heat of ionisation of HCN is 10.8Kcal

the heat of neutralisation is different
For weak acids and bases, the heat of neutralisation is different because they are not dissociated completely and during dissociation some heat is absorbed - total heat evolved during neutralisation will be smaller. The heat of ionisation in this reaction is equal to (–12 + 57.3) kJ/mol = 45.3 kJ/mol.
therefore the heat is 45.3 kJ/mol
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