Chemical equilibrium studies on the iron(III)-sulfuric acid/β-alkenyl 8 hydroxy-quinoline-xylene system

R. K. Agarwal, Lawrence L Tavlarides

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Abstract

A thermodynamic equilibrium model is developed for the distribution of iron(III) between phases of the system ferric sulfate-sulfuric acid/β-alkenyl-8-hydroxyquinoline in xylene. Equilibrium data are obtained in the range [Fe]T (0.01 to 0.20 mol/dm3), pH (0.2 to 2.0), [HR] (0.02 to 0.06 mol/dm3) and temperature T(298 to 323 K). The best fit of the data from a linear regression results in the following equation: % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqefm0B1jxALjhiov2D% aebbfv3ySLgzGueE0jxyaibaieYlf9irVeeu0dXdh9vqqj-hEeeu0x% Xdbba9frFj0-OqFfea0dXdd9vqaq-JfrVkFHe9pgea0dXdar-Jb9hs% 0dXdbPYxe9vr0-vr0-vqpWqaaeaabaGaciaacaqabeaadaqaaqaaaO% qaaiGacYgacaGGUbWaaSaaaeaadaWadaqaamaanaaabaGaamOraiaa {Mathematical expression} The regression analysis employs the aqueous phase ionic concentration of [Fe+3] and [H+], which are obtained by consideration of pertinent aqueous phase species equilibria. This model includes the effects of ionic strength on the aqueous phase equilibrium concentration. The stoichiometry of the given reaction is established using the method of continuous variation. Presence of only one species in the organic phase is also determined by the method of continuous variation. The results indicate that the enthalpy of the reaction and the entropy change are -21.8 kJ/mole and -0.05 J/mole K, respectively.

Original languageEnglish (US)
Pages (from-to)615-620
Number of pages6
JournalMetallurgical Transactions B
Volume17
Issue number4
DOIs
StatePublished - Dec 1986

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry
  • Mechanics of Materials
  • Engineering(all)

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