NDLI: Structure of aqueous sodium sulfate solutions derived from X-ray diffraction

Content Provider	Springer Nature Link
Author	Xu, JiXiang Fang, Yan Fang, ChunHui
Copyright Year	2009
Abstract	A rapid liquid X-ray diffractometer was used to study the time-averaged and space-averaged structure of aqueous sodium sulfate solutions at 298 and 323 K. Difference radial distribution functions of the solutions were obtained from accurate diffraction data. The interaction distances of Na$^{+}$-OH$_{2}$ and S-H$_{2}$O in solutions were found to be 0.235 and 0.385 nm, respectively, after deconvolution of superposition peaks by Gaussian multi-peak fitting program. The characteristic distance of the NaSO 4 − contact ion pairs in higher concentration solutions was determined to be 0.345 nm, suggesting that the Na$^{+}$ ions coordinated with SO 4 2− ions in the mono-dentate form. Effects of concentration and temperature on the hydration structure of the solutions were discussed in the present paper. With a decrease in concentration, the contributions of the H$_{2}$O to the diffraction pattern increase, the average coordination number of the Na$^{+}$ ions hardly changes, while the hydration number of SO 4 2− ions increases slightly. The formation of NaSO 4 − contact ion pairs becomes easier at higher temperature. The structure of hydrogen bond in dilute solutions is broken to a considerable extent with rising temperature, and the peak at 0.290 nm splits into two peaks at 0.275 and 0.305 nm, respectively.
Starting Page	2022
Ending Page	2027
Page Count	6
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	54
Issue Number	12
e-ISSN	18619541
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-06-18
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	solution structure sodium sulfate radial distribution function contact ion pairs X-ray diffraction Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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