8. Thermochemistry
Enthalpy of Formation
24PRACTICE PROBLEM
Based on the given neutralization reactions with their enthalpy of neutralization, determine whether HCN is a weak or strong acid.
NaOH (aq) + HCl (aq) → Na+ (aq) + Cl- (aq) + H2O (l) ΔH° = -57.9 kJ/mol
NaOH (aq) + CH3COOH (aq) → Na+ (aq) + CH3COO- (aq) + H2O (l) ΔH° = -56.1 kJ/mol
NaOH (aq) + HCN (aq) → Na+ (aq) + CN- (aq) + H2O (l) ΔH° = -12.13 kJ/mol
Based on the given neutralization reactions with their enthalpy of neutralization, determine whether HCN is a weak or strong acid.
NaOH (aq) + HCl (aq) → Na+ (aq) + Cl- (aq) + H2O (l) ΔH° = -57.9 kJ/mol
NaOH (aq) + CH3COOH (aq) → Na+ (aq) + CH3COO- (aq) + H2O (l) ΔH° = -56.1 kJ/mol
NaOH (aq) + HCN (aq) → Na+ (aq) + CN- (aq) + H2O (l) ΔH° = -12.13 kJ/mol