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Calorimetric measurements of sodium chloride dihydrate (hydrohalite)

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Abstract

Calorimetric measurements of sodium chloride dihydrate NaCl·2H2O (mineral name hydrohalite) were carried out with using DSC. Heat capacity from 190 to 250 K was measured and found to increase from 109 to 137 J mol−1 K−1. The enthalpy of formation of hydrohalite from solid ice and halite at 273.15 K was derived from the thermal effect of melting/decomposition in DSC measurements and found to be close to − 1.8 kJ mol−1. The same DSC results show clearly that the upper temperature limit for the existence of hydrohalite is several degrees greater than the current value of 273.15 K accepted for the peritectic decomposition of hydrohalite. The phase diagram of the NaCl–H2O system needs correction.

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Acknowledgements

VAD acknowledges that his work was supported by state assignment Project No. 0330-2019-0004.

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Correspondence to V. A. Drebushchak.

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Drebushchak, V.A., Ogienko, A.G. Calorimetric measurements of sodium chloride dihydrate (hydrohalite). J Therm Anal Calorim 140, 2555–2562 (2020). https://doi.org/10.1007/s10973-019-08954-7

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