Polarographic studies of the fluoride complexes of tin(II) in neutral and acidic media

A. M. Bond, R. J. Taylor

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Conventional d.c. polarographic measurements on aqueous solutions containing stannous and fluoride ions have shown the existence of the species SnF+, SnF2, and SnF3-, with stability constants (at 25°C and an ionic strength of 1.0) of 1×104 l mol-1, 7×106 l2 mol-2 and 2.7×109 l3 mol-3 respectively. Rapid a.c. measurements in acidic solutions under conditions in which all fluoride ion may be assumed to exist as undissociated hydrofluoric acid have also shown the existence of the same species with stability constants of 32, 35, and 58 respectively for the equilibria Sn2++nHF⇌SnF(2-n)n+nF- or 1.2×104 l mol-1, 4.8×106 l2 mol-2, and 2.9×109 l3 mol-3 for the equilibria Sn2++nF-⇌SnF(1-n+n The results in acidic media were obtained using an equation suggested previously by Bond, and the excellent agreement of the results with the standard calculation method of DeFord and Hume indicates that the equation and experimental method could be used generally for any complexing ligand derived from a weak acid.

Original languageEnglish
Pages (from-to)207-215
Number of pages9
JournalJournal of Electroanalytical Chemistry and Interfacial Electrochemistry
Issue number1
Publication statusPublished - Nov 1970
Externally publishedYes

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