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 language | English |
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Pages (from-to) | 1919-1927 |
Number of pages | 9 |
Journal | Journal of Chemical Thermodynamics |
Volume | 34 |
Issue number | 12 |
DOIs | |
State | Published - 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