Hydration of complexed chloride ions in aqueous zinc(II) chloride solution

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The chloride ion coordination numbers, obtained from the neutron diffraction experiments of Powell et al.1 on aqueous ZnCl2 solutions, are analyzed assuming inner-sphere complexing of the chloride ion by zinc. Several of the different published sets of stability constants, which describe the equilibria between the various zinc complexes present in solution, are used to determine the mean number of water molecules, x̄, in the complex ClZn(H2O)+. It is shown that, irrespective of the set of stability constants used, x̄ is independent of concentration, within the experimental uncertainty of the neutron data, and takes a value in the range from 3.2 to 3.6. This result implies that the mean number of water molecules displaced from free chloride ions on complexing with Zn2+ is constant and independent of whether the chloride ion is incorporated in the species ZnCl+, ZnCl2, ZnCl3-, or ZnCl42-.

Original languageEnglish
Pages (from-to)1182-1184
Number of pages3
JournalJournal of Physical Chemistry
Issue number4
Publication statusPublished - 1 Feb 1989

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry


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