Structure of the Immediate Environment of Ions in Aqueous Solutions of Calcium Chloride, Based on Data from X-ray Diffraction Analysis

X-ray diffraction (XRD) analysis is used to determine quantitative characteristics of the immediate environment of ions in aqueous solutions of calcium chloride in a wide range of concentrations. It is found that the complex ionic associate formed in a saturated solution consisting of a cation that...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2022-04, Vol.96 (4), p.743-747
Main Authors: Smirnov, P. R., Grechin, O. V.
Format: Article
Language:English
Subjects:
Aqueous solutions
Calcium chloride
Calcium ions
Cations
Chemistry
Chemistry and Materials Science
Coordination
Dilution
Disintegration
Ions
ON THE 90th ANNIVERSARY OF THE BIRTH OF G.A. KRESTOV
Physical Chemistry
Water chemistry
X-ray diffraction
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Summary:X-ray diffraction (XRD) analysis is used to determine quantitative characteristics of the immediate environment of ions in aqueous solutions of calcium chloride in a wide range of concentrations. It is found that the complex ionic associate formed in a saturated solution consisting of a cation that coordinates the anions in both the first and second shells disintegrates upon diluting the solution. The Cl − ion from the first coordination sphere leaves the immediate environment of the cation first, and is followed by an ion from the second shell. In a diluted solution, the ions are independently hydrated. The process is accompanied by an increase in the number of water molecules in the first coordination sphere of the Ca 2+ ion from 5.2 up to 6.5.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024422040288