Abstract
This paper presents the results of the thermochemical study of hydrous copper sulfate CuSO4·5H2O performed on a high-temperature heat-flux Tian–Calvet microcalorimeter. The samples of two natural chalcanthite (Kosmurun ore deposit, Kazakhstan, and Lavrion deposit, Greece) and synthetic hydrous copper sulfate (blue vitriol) were characterized by X-ray microprobe analysis, X-ray powder diffraction, thermal analysis, FTIR and Raman spectroscopy. The enthalpy of dehydration at T=298.15K was measured, and the standard molar enthalpies of formation from the elements were determined by the melt solution calorimetry in accordance with Hess’s law. The values of ΔfHm0 (T=298.15K) were found to be −(2267.2±4.1)kJ⋅mol−1 for natural chalcanthite and −(2272.6±6.0)kJ·mol−1 for synthetic hydrous copper sulfate (blue vitriol).
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