Abstract
Ethylenediamine dihydrochloride (C 2H 10N 2Cl 2)(s) was synthesized. The crystal structure of the compound has been determined by X-ray crystallography. The lattice potential energy and ionic radius of the cation of the compound were obtained from the crystallographic data. Molar enthalpies of dissolution of the compound in double-distilled water under various values of molality were determined at T = 298.15 K by an isoperibol solution-reaction calorimeter. Following to Pitzer’s theory, the molar enthalpy of dissolution of the compound at infinite dilution ( Δ sol H m ∞ ) and the Pitzer parameters ( β MX ( 0 ) L and β MX ( 1 ) L ) were obtained. The values of relative apparent molar enthalpies ( Φ L ), relative partial molar enthalpies ( L ¯ 2 ) of the compound and relative partial molar enthalpies ( L ¯ 1 ) of the solvent at different concentrations m/(mol · kg −1) were derived from the experimental values of the enthalpies of dissolution of the compound. Finally, the hydration enthalpy of the cation of the substance was calculated by designing a thermochemical cycle.
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