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Title: Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl[sub 3] between 50 and 150[degree]C

Abstract

By means of a flow calorimeter, the specific heats of aqueous solutions containing AlCl[sub 3] with and without added HCl have been measured at 50, 100, and 150[degree]C. The apparent molar heat capacity C[sub p,[phi]] of the HCl-containing solutions have allowed the calculation of the standard molar heat capacity of AlCl[sub 3], C[sup [minus]0][sub p,AlCl[sub 3]]. These data satisfactorily link together with those of Hovey and Tremaine in the range 10-55[degree]C, afterwards reassessed by Barta and Hepler, 1986. The treatment of the C[sup p,[phi]] data with the ionic interactions model of Pitzer has provided the values of [beta][sup (0)J] and [beta][sup (1)J] for the calculation of C[sup AlCl[sup 3]][sub p,[phi]] in the concentration range 0.03-0.75 mol kg[sup [minus]1] at the temperatures studied. Experimental values of the apparent molar heat capacities obtained for hydrolyzed solutions have been compared with the analogous quantities calculated accounting for the C[sub p,[phi],i] of all species present at equilibrium, as well as for the chemical relaxation term, C[sup rel][sub p,[phi]], which is due to the energy absorbed by the hydrolysis shift induced by the heating inherent in the specific heat measurement. The calculation has been carried out on the basis of some hydrolytic schemes proposed inmore » the literature and has provided useful insights on the hydrolysis reaction at temperatures where the extent of reaction is quite marked.« less

Authors:
;  [1];  [2]
  1. Dipartimento di Chimica e Chimica Industriale, Pisa (Italy)
  2. Istituto di Chimica Quantistica ed Energetica Molecolare, Pisa (Italy)
Publication Date:
OSTI Identifier:
7030950
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta; (United States)
Additional Journal Information:
Journal Volume: 56:12; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; ALUMINIUM CHLORIDES; HYDROLYSIS; SPECIFIC HEAT; AQUEOUS SOLUTIONS; CALORIMETRY; RELAXATION; ALUMINIUM COMPOUNDS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; DECOMPOSITION; DISPERSIONS; HALIDES; HALOGEN COMPOUNDS; LYSIS; MIXTURES; PHYSICAL PROPERTIES; SOLUTIONS; SOLVOLYSIS; THERMODYNAMIC PROPERTIES; 400201* - Chemical & Physicochemical Properties; 360606 - Other Materials- Physical Properties- (1992-)

Citation Formats

Conti, G, Gianni, P, and Matteoli, E. Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl[sub 3] between 50 and 150[degree]C. United States: N. p., 1992. Web. doi:10.1016/0016-7037(92)90255-H.
Conti, G, Gianni, P, & Matteoli, E. Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl[sub 3] between 50 and 150[degree]C. United States. https://doi.org/10.1016/0016-7037(92)90255-H
Conti, G, Gianni, P, and Matteoli, E. Tue . "Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl[sub 3] between 50 and 150[degree]C". United States. https://doi.org/10.1016/0016-7037(92)90255-H.
@article{osti_7030950,
title = {Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl[sub 3] between 50 and 150[degree]C},
author = {Conti, G and Gianni, P and Matteoli, E},
abstractNote = {By means of a flow calorimeter, the specific heats of aqueous solutions containing AlCl[sub 3] with and without added HCl have been measured at 50, 100, and 150[degree]C. The apparent molar heat capacity C[sub p,[phi]] of the HCl-containing solutions have allowed the calculation of the standard molar heat capacity of AlCl[sub 3], C[sup [minus]0][sub p,AlCl[sub 3]]. These data satisfactorily link together with those of Hovey and Tremaine in the range 10-55[degree]C, afterwards reassessed by Barta and Hepler, 1986. The treatment of the C[sup p,[phi]] data with the ionic interactions model of Pitzer has provided the values of [beta][sup (0)J] and [beta][sup (1)J] for the calculation of C[sup AlCl[sup 3]][sub p,[phi]] in the concentration range 0.03-0.75 mol kg[sup [minus]1] at the temperatures studied. Experimental values of the apparent molar heat capacities obtained for hydrolyzed solutions have been compared with the analogous quantities calculated accounting for the C[sub p,[phi],i] of all species present at equilibrium, as well as for the chemical relaxation term, C[sup rel][sub p,[phi]], which is due to the energy absorbed by the hydrolysis shift induced by the heating inherent in the specific heat measurement. The calculation has been carried out on the basis of some hydrolytic schemes proposed in the literature and has provided useful insights on the hydrolysis reaction at temperatures where the extent of reaction is quite marked.},
doi = {10.1016/0016-7037(92)90255-H},
url = {https://www.osti.gov/biblio/7030950}, journal = {Geochimica et Cosmochimica Acta; (United States)},
issn = {0016-7037},
number = ,
volume = 56:12,
place = {United States},
year = {1992},
month = {12}
}