University of Oulu

Vielma, T., Hnedkovsky, L. & Hefter, G. Measurement and Prediction of Molar Volumes of Bivalent Metal Sulfates and Their Mixtures in Aqueous Solution. J Solution Chem (2023).

Measurement and prediction of molar volumes of bivalent metal sulfates and their mixtures in aqueous solution

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Author: Vielma, Tuomas1; Hnedkovsky, Lubomir2; Hefter, Glenn2
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, Pentti Kaiteran katu 1, 90014, Oulu, Finland
2Chemistry Department, Murdoch University, 90 South St, Murdoch, WA, 6150, Australia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
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Language: English
Published: Springer Nature, 2023
Publish Date: 2023-03-21


Densities of aqueous solutions of MnSO4, CoSO4, NiSO4 and CuSO4 have been measured by vibrating tube densimetry up to near-saturation concentrations over the temperature range 293.15 ≤T/K ≤ 343.15 at 5 K intervals and at 0.1 MPa pressure. Apparent molar volumes, Vϕ, calculated from the densities revealed close similarities among all four electrolytes, with their Vϕ values essentially differing by constant concentration-independent addends for each salt at each temperature. It was found that there is an almost linear relationship between Vϕ(MSO4,aq) and the M–O bond length of the hydrated cations obtained from structural studies. This relationship can be used to predict values of Vϕ(MSO4,aq) for other sulfate salts over wide ranges of concentration and temperature, providing that the requisite structural data are available. Measurements of selected ternary, quaternary and quinary mixtures of these electrolytes at constant total concentrations showed that their Vϕ values almost always exhibit linear mixing (Young’s rule) behavior at all temperatures investigated. This finding can be exploited to predict the volumetric properties of solutions containing complex mixtures of bivalent metal sulfates.

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Series: Journal of solution chemistry
ISSN: 0095-9782
ISSN-E: 1572-8927
ISSN-L: 0095-9782
DOI: 10.1007/s10953-023-01252-9
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: This work was funded by the Finnish Cultural Foundation (PoDoCo program), Walter Ahlström Foundation, Finnish Research Impact Foundation (TV) and Murdoch University (LH & GH). Open Access funding provided by University of Oulu including Oulu University Hospital.
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