Aluminum speciation and equilibria in aqueous solution: III. Potentiometric determination of the first hydrolysis constant of aluminum(III) in sodium chloride solutions to 125°C

Details Aluminum speciation and equilibria in aqueous solution: III. Potentiometric determination of the first hydrolysis constant of aluminum(III) in sodium chloride solutions to 125°C Aluminum speciation and equilibria in aqueous solution: III. Potentiometric determination of the first hydrolysis constant of aluminum(III) in sodium chloride solutions to 125°C

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2929p&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 57, Issue 13, p. 2929-2938.

Computer Science

5

Scientific paper

The first molal hydrolysis quotient of aluminum(III) was measured potentiometrically from 25 to 125°C at 25° intervals at ionic strengths of 0.1, 0.3, 1.0 and 5 mol · kg-1 with sodium chloride as the supporting electrolyte. The experimental method involved using a hydrogen-electrode concentration cell modified to compensate for any intrinsic potential offset between the two electrodes. The initial concentration of Al3+ was varied to test for the presence of multinuclear aluminum species while being kept to a maximum of 10-3 mol · kg-1 to minimize their occurrence. Similarly, the maximum degree of hydrolysis of Al3+ reached in each titration was ca. 30%, after which polymerization and/or precipitation became apparent. The equilibrium quotients obtained in this study and selected values from the literature were fitted by an empirical equation incorporating a linear dependence of log K1,1 on the reciprocal temperature (Kelvins) over the range 10 200°C and three ionic-strength-dependent parameters. Comparisons are made between the results of this study and the literature values.

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