Question:
What is heat evolved using neutralization of HCN by a strong 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/mol
The heat of ionization in this reaction is equal to (–12 + 57.3) kJ/mol = 45.3 kJ/mol.
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