Why is heat evolved during the reaction of acid and base

1.	Why is heat evolved during the reaction of acid and base
Answer» For weak acids and bases, the heat of neutralization is different because they are not dissociated completely and during dissociation some heat is absorbed - total heat evolved during neutralization will be smaller.HCN + NaOH → NaCN + H2O; ΔH = -12 kJ/molThe heat of ionization in this reaction is equal to (–12 + 57.3) kJ/mol = 45.3 kJ/mol. because it is an exothermic reaction

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