Solubility products, thermodynamic functions and stability constants for the praseodymium and ytterbium fluoride — Water systems

M. Menon; J. James; R. Abbas

doi:10.1007/bf02037576

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 129: Issue 1

Solubility products, thermodynamic functions and stability constants for the praseodymium and ytterbium fluoride — Water systems

Authors:

M. Menon

M. Menon Savannah State College Department of Chemistry Savannah Georgia (USA)

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J. James

J. James Savannah State College Department of Chemistry Savannah Georgia (USA)

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, and

R. Abbas

R. Abbas Savannah State College Department of Chemistry Savannah Georgia (USA)

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Pages:: 133–148

Online Publication Date:: 14 Aug 2005

Publication Date:: 17 Jan 1989

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02037576

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Abstract

The solubility products and thermodynamic functions for the praseodymium and ytterbium fluoride-water systems have been measured using different analytical techniques for comparison among the measured values as well as with values reported in literature. Although there is not much difference among our values obtained by potentiometric, conductometric and radiometric methods, the values for PrF₃ disagree with at least two of the reported values. The effects of precipitant, aging of the precipitate and pH of the saturated solutions on the solubility product were studied and found to be significant. The standard enthalpy and free energy changes for the dissolution of both fluorides were found to be positive although the enthalpy for YbF₃ is about twice as high as that for PrF₃. The standard entropy change for PrF₃ is negative, but that for YbF₃ is positive. The overall stability constants for the mono- and difluoride complexes of both Pr and Yb have also been measured potentiometrically using a simplified approach.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)