Aluminum speciation and equilibria in aqueous solution: I. The solubility of gibbsite in the system Na-K-Cl-OH-Al(OH) 4 from 0 to 100°C

Details Aluminum speciation and equilibria in aqueous solution: I. The solubility of gibbsite in the system Na-K-Cl-OH-Al(OH) 4 from 0 to 100°C Aluminum speciation and equilibria in aqueous solution: I. The solubility of gibbsite in the system Na-K-Cl-OH-Al(OH) 4 from 0 to 100°C

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1065w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 3, pp.1065-1091

Computer Science

9

Scientific paper

The solubility of gibbsite, Al(OH) 3 , has been measured in a large number of solutions in the system Na-K-Cl-OH-Al(OH) 4 from 6.4 to 80°C and 0.01 to 5.0 molal ionic strength. These results have been coupled with selected literature data and modeled using the Pitzer ion interaction treatment. An eight-parameter expression is derived for the molal concentration quotient of the reaction Al(OH) 4 - Al(OH) 3 + OH - in this system from which the equilibrium constant at infinite dilution, log K 4 , and the stoichiometric molal activity coefficient ratio, log ( OH - / Al ( OH ) 4 - ), can be evaluated over the range 0-100°C and 0-12 molal ionic strength at 1 bar with a precision of approximately ±0.02 log units. Standard thermodynamic properties of the reaction at 25°C and 1 bar are log K 4 = 1.143 ± 0.006, H ° = -22.5 ± 0.3 kJ/mol, S ° = -54 ± 1 J/K/mol, and C p 0 = -148 ± 6 J/K/mol. From these quantities and the standard thermodynamic properties of gibbsite, the values of G f 0 , H f 0 , and S 0 of [Al(OH) 4 - ] aq at 25°C and 1 bar are computed to be -1305.6 ± 1.2 kJ/mol, -1500.6 ± 1.5 kJ/mol, and 111.4 J/K/mol, respectively. Approximate values of the pure electrolyte parameters 0 , 1 , and C for NaAl(OH) 4 and KAl(OH) 4 as well as the mixing parameters for aluminate ion with OH - , OH - + Na + , and OH - + K + are also obtained.

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