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.

Original languageEnglish
Pages (from-to)2555-2562
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume140
Issue number5
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • DSC
  • Enthalpy of formation
  • Heat capacity
  • Hydrohalite
  • SEA-ICE
  • SYSTEM
  • THERMODYNAMIC PROPERTIES
  • PHASE
  • THERMAL-ENERGY STORAGE

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