The selective solvation of silver(I) iodate was studied in methanoldimethyl sulohoxide mixtures at 30° C by solubility and EMF measurements. The solubility of the salt increases continuously with the addition of dimethyl sulphoxide after a slight decrease into XDMSO =0.1. The Gibbs energy of transfer of silver cation (determined on the basis of ferrocene reference method) decreases continuously while that of the iodate ion increases with the addition of dimethyl sulphoxide. The solvent transport number passes through a maximum (Δ = 2.0) around XDMSO = 0.5. These results were interpreted as arising due to a heteroselective solvation of the salt, the silver ions being preferentially solvated by dimethyl sulphoxide and the iodate ion by methanol in these mixtures. © 1981 Indian Academy of Sciences.

S. Janardhanan

Chatty Kalidas

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IIT Madras

Selective solvation of Ag(I) iodate in methanol-dimethyl sulphoxide mixtures

Proceedings of the Indian Academy of Sciences - Chemical Sciences

The solvent transference number, Δ, of Ag2SO4 in mixtures of methanol and Nmethylformamide (NMF) was determined by e.m.f. experiments using a galvanic cell with transference as introduced by C. Wagner [4]. The solvent composition was varied over the entiremole fraction range, corresponding to a change in the dielectric constant from 32 to 180 by abouta factor of 6. The solvent transference number was always not equal zero which means that thereis a preferred transport of NMF towards the cathode compartment. passes through two maximal values with changing mole fraction and decreases to nearly zero in the mixture; thisbehaviour is unusual when compared with results from otherpolar solvent mixtures. With the help of the Gibbs energies of solvation of the ionic species obtained from additionalexperimentsit could be shown that the special behaviour of is due to a transition from heteroselective solvation to homoselective solvation of Ag2SO4 by NMF. © by Akademische Verlagsgesellschaft

Fulltext

Zeitschrift fur Physikalische Chemie

Solvent transference numbers and solvation energies of silver sulphate in mixtures of methanol and n-methylformamide

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ChemInform Abstract: SOLVENT TRANSFERENCE NUMBERS AND SOLVATION ENERGIES OF SILVER SULFATE IN MIXTURES OF METHANOL AND N-METHYLFORMAMIDE

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Journal	Data powered by TypesetProceedings of the Indian Academy of Sciences - Chemical Sciences
Publisher	Data powered by TypesetSpringer India
ISSN	03700089
Open Access	No