Heats of dilution and related thermodynamic properties of aqueous neodymium chloride and erbium chloride solutions

dc.contributor.author Naumann, Alfred
dc.contributor.department Chemistry
dc.date 2018-08-23T06:09:01.000
dc.date.accessioned 2020-06-30T07:23:20Z
dc.date.available 2020-06-30T07:23:20Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 1956
dc.date.issued 1956
dc.description.abstract <p>A differential calorimeter has been constructed to measure the heats of dilution of electrolytic solutions. The differential method made possible the determination of heats of dilution to within a few thousands of a calorie. Precision of this order was necessary to obtain meaningful values for the thermodynamic properties of very dilute solutions;The heats of dilution of neodymium chloride and erbium chloride solutions have been measured at 25°C for concentrations up to 0.2 molal. Empirical expressions for the relative apparent molal heat content of the solute, &phis; L; the relative partial molal heat content of the solvent, L¯1; and the relative partial molal heat content of the solute, L¯2, have been derived from the heats of dilution. The following equations have been derived for neodymium chloride solutions: fL=6925 m1/2-16725 m+22278m3/2 -7596m2, 74 L1&d1;= -62.37m 3/2+301.32m2 -602.04m5/2+273.70 m3 ,80 L2&d1;=10387 m1/2-33450 m+55695m 3/2+22788 m2. 79 The corresponding equations for erbium chloride solutions were as follows: fL=5687 m1/2-8637m +7066m3/2, 87 L1&d1;=-51.2 3m3/2+155.60 m2-190.95 m5/2, 88 L2&d1;=8531 m1/2-17274 m+17665m 3/2. 89;The thermodynamic properties of neodymium chloride and erbium chloride solutions were the same, within experimental error, for concentrations above 0.02 molal. For concentrations below 4 x 10-4 molal, the thermodynamic properties of neodymium chloride solutions followed the Debye-Huckel law predictions, but the thermodynamic properties of erbium chloride solutions appeared to depart from theoretical predictions.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/12733/
dc.identifier.articleid 13732
dc.identifier.contextkey 6822809
dc.identifier.doi https://doi.org/10.31274/rtd-180813-13997
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/12733
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/66134
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/12733/r_DP12059.pdf|||Fri Jan 14 19:28:45 UTC 2022
dc.subject.disciplines Physical Chemistry
dc.subject.keywords Rare earths
dc.subject.keywords Heat of solution
dc.subject.keywords Chemistry
dc.subject.keywords Physical chemistry
dc.title Heats of dilution and related thermodynamic properties of aqueous neodymium chloride and erbium chloride solutions
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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