Ultraviolet Spectroscopic Study of Ferric Equilibria at High Chloride Concentrations

Robert H. Byrne, Dana R. Kester

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Abstract

The equilibria among the species Fe 3+ , FeCl 2+ , FeCl 2 + , FeOH 2+ and Fe(OH) 2 + have been examined by ultraviolet absorption spectroscopy. Our results indicate that previous workers have generally overestimated the stability constant of FeCl 2+ and that the association of Fe 3+ and Cl is predominantly inner sphere. The formation constant of FeOH 2+ obtained in 0.68 m NaCl is in good agreement with our earlier results obtained in 0.68 m NaClO 4 . Our results indicate that formation of FeOHCl + is much less significant than has been previously reported. Molar absorptivities for the species Fe 3+ , FeCl 2+ , FeCl 2 + and FeOH 2+ are reported for wavelengths between 220 and 400 nanometers.

Original languageAmerican English
JournalJournal of Solution Chemistry
Volume10
DOIs
StatePublished - Jan 1 1981

Keywords

  • Hydrolysis
  • ferric chloride
  • ferric hydroxide
  • UV spectroscopy
  • complexes
  • ion pairs

Disciplines

  • Life Sciences

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