Calorimetric measurements of sodium chloride dihydrate (hydrohalite)

  • V. A. DrebushchakEmail author
  • A. G. Ogienko


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.


DSC Enthalpy of formation Heat capacity Hydrohalite 



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


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.V.S. Sobolev Institute of Geology and Mineralogy, SB RASNovosibirskRussia
  2. 2.Novosibirsk State UniversityNovosibirskRussia

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