Project Details Solubility of Alkaline Earth Metal Chlorides in Water

Project No.:
Start Date:
01 May 2016
End Date:
30 August 2019
Division Name:
Analytical Chemistry Division
Division No.:


The project concerns a further volume within the “Solubility Data Series” of IUPAC-NIST.

Besides sodium chloride alkaline earth chlorides represent the most important constituents in natural aqueous solutions as in seawater, salt lake brines, pore fluids in concrete etc. Thermodynamic modelling of these solutions is a prerequisite for environmental research and a large variety of technologies. Solubility of compounds provides a source of thermodynamic information. In this project all the available solubility and phase diagram information of the binary systems (MgCl2, CaCl2, SrCl2, BaCl2, RaCl2)-H2O will be collected and evaluated in the framework of the SDS series volumes. Members of the task group have already experience in preparation of SDS volumes and in this case also to the intended class of compounds from present and earlier scientific work. The temperature range will extend from cryo-hydratic points to about 250°C. This includes also the range of molten hydrates of MgCl2 and CaCl2.
The project will provide recommended best solubility data for the alkaline earth chlorides.


All experimentally determined solubility data of the intended binary salt – water systems are collected from original data sources. As sources all scientific literature world-wide from the 19th century to present day are considered. Data will be tabulated and recalculated to units, accepted as standard units by IUPAC. Additional remarks concerning the applied experimental techniques, errors etc. support the reader in understanding the data selection or recommendation as best data.

The data will then be subjected to an evaluation procedure as was done in previous SDS volumes. Particularly for the intended alkaline earth metal chlorides the recommended temperature dependence of solubility will be given in a mathematical form consistent with thermodynamic formalism,which were used in several volumes already (e.g. volume 42 “Alkali metal and ammonium chlorides in water …”) and is formulated in the guidelines Pure Appl. Chem., Vol. 82, No. 5, pp. 1137–1159, 2010 (, for preparation and use of compilations and evaluations.


project terminated

Page last updated 30 Aug 2019