Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl 3 between 50 and 150°C

Details Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl 3 between 50 and 150°C Apparent molar heat capacity of aqueous hydrolyzed and non-hydrolyzed AlCl 3 between 50 and 150°C

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.4125c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 12, pp.4125-4133

Computer Science

Scientific paper

By means of a flow calorimeter, the specific heats of aqueous solutions containing AlCl 3 with and without added HCl have been measured at 50, 100, and 150°C. The apparent molar heat capacity C p , of the HCl-containing solutions have allowed the calculation of the standard molar heat capacity of AlCl 3 , . These data satisfactorily link together with those of Hovey and Tremaine in the range 10-55°C ( and , 1986), afterwards reassessed by and 1986. The treatment of the C p , data with the ionic interactions model of Pitzer has provided the values of (0)J and (1)J for the calculation of C AlCl 3 p , in the concentration range 0.03-0.75 mol kg -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 p , , i of all species present at equilibrium, as well as for the chemical relaxation term, C rel p , , 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.

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