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The standard enthalpy of neutralisation of HCl by NaOH is -57.62 kJ mol-1, which is the enthalpy of formation of water.
The standard enthalpy of neutralisation of HCN by NaOH is
  • a)
    -57.62 kJ mol-1
  • b)
    > -57.62 kJ mol-1
  • c)
    < -57.62 kJ mol-1
  • d)
    cannot be predicted
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The standard enthalpy of neutralisation of HCl by NaOH is -57.62 kJ mo...
Enthalpy of neutralisation is defined as the amount of heat evolved when 1 equivalent of H+ ions from an acid is completely neutralised by 1 equivalent of HO- ions from a base.
For a strong base and a strong acid, which are strong electrolytes, this value is fixed under standard conditions at -57.62 kJ mol-1.
But for a weak acid like HCN or a weak base, the value is less as some of the heat liberated is utilised to ionise the weak acid or the weak base.
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Community Answer
The standard enthalpy of neutralisation of HCl by NaOH is -57.62 kJ mo...
The standard enthalpy of neutralization of HCN by NaOH is not given. It cannot be determined based on the information provided.
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The standard enthalpy of neutralisation of HCl by NaOH is -57.62 kJ mol-1, which is the enthalpy of formation of water.The standard enthalpy of neutralisation of HCN by NaOH isa)-57.62 kJ mol-1b)> -57.62 kJ mol-1c)< -57.62 kJ mol-1d)cannot be predictedCorrect answer is option 'C'. Can you explain this answer?
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