Thermodynamics of proton ionization in aqueous solution. Part XII. ΔH°, ΔS°, and ΔCp° values for hydrocyanic acid dissociation at 10, 25, and 40°

Abstract

Values of ΔH° and ΔS° for hydrocyanic acid dissociation have been determined to be, respectively, 11·33 and –4·05 (10°), 10·43, and –7·19 (25°), and 9·57 kcal. mole^–1 and –10·26 cal. deg.^–1 mole^–1(40°). From the variation of ΔH° with temperature, a value of –60 cal. deg.^–1 mole^–1 is calculated for ΔC_p° at 25°. All values are valid at infinite dilution.