Thermochemistry of the Acid-Base Interactions in Aqueous Solutions of Isonicotinic and Picolinic Acids

详细

The calorimetric method was employed to measure the heat effects of the interaction of isonicotinic and picolinic acids with HNO₃in aqueous solutions over different pH ranges at 298.15 K and ionic strengths of 0.5, 1.0, and 1.5 against potassium nitrate. The heat effects of stepwise dissociation of the acids were determined. The standard thermodynamic characteristics (Δ_rH°, Δ_rG°, Δ_rS°, ΔC_p°) of the acid-base reactions in aqueous solutions of isonicotinic and picolinic acids were calculated.