The molar enthalpies of solution and vapour pressures of saturated aqueous solutions of aluminium chloride, aluminium nitrate and aluminium sulphate

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Abstract

Vapour pressures of water over saturated solutions of aluminium chloride, aluminium nitrate and aluminium sulphate were determined as a function of temperature. The vapour pressures served to evaluate the water activities, osmotic coefficients and molar enthalpies of vaporization. Molar enthalpies of solution of aluminium chloride hexahydrate, ΔsolHm(AlCl3·6H2O, T = 295.02 K, m = 0.02084 mol·kg-1) = -(54.6 ± 2.1) kJ·mol-1, aluminium nitrate nonahydrate, ΔsolHm(Al(NO3)3·9H 2O; T = 296.62 K, m = 0.01342 mol·kg-1) = (30.7 ± 1.0) kJ·mol-1 and aluminium sulphate octadecahydrate, ΔsolHm(Al2(SO4) 3·18H2O, T = 297.60 K, m = 0.00756 mol·kg-1) = -(46.4 ± 2.5) kJ·mol-1, were determined calorimetrically.

Original languageEnglish
Pages (from-to)1919-1927
Number of pages9
JournalJournal of Chemical Thermodynamics
Volume34
Issue number12
DOIs
StatePublished - 1 Jan 2002

Keywords

  • Molar enthalpies of vaporization and solution
  • Osmotic coefficients
  • Saturated solutions
  • Vapour pressures
  • Water activities

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Physical and Theoretical Chemistry

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