An empirical correlation between the enthalpy of solution of aqueous salts and their ability to form hydrates

Journal Article · Thu Sep 30 00:00:00 EDT 2010 · Journal of Physical Chemistry A, 114(38):10454-10457

DOI:https://doi.org/10.1021/jp106050r· OSTI ID:990537

Pandelov, S; Werhahn, Jasper C; Pilles, Bert M; Xantheas, Sotiris S; Iglev, H

The ability of aqueous salt solutions to form hydrates by cooling them at ambient pressure is probed by infrared (IR) spectroscopy by examining the structure of the spectra in the hydrogen-bonding region (3,000 - 3,800 cm-1). A collection of 75 organic and inorganic salts in saturated solutions are examined. We have found a correlation between the enthalpy of solution of the salt and its ability to form a hydrate, namely that the salt’s enthalpy of solution is lower than the standard enthalpy of fusion of ice (6 kJ/mol). This observation can serve as an empirical rule that determines whether a salt will form a hydrate upon cooling from its aqueous solution.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 990537
• Report Number(s): PNNL-SA-73993; KC0301020; TRN: US201020%%397
• Journal Information: Journal of Physical Chemistry A, 114(38):10454-10457, Vol. 114, Issue 38
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
ENTHALPY
HYDRATES
SPECTRA
SPECTROSCOPY