Solubility and Hydrolysis of La, Pr, Eu, Er, and Lu in 1 M NaCl Ionic Strength at 303 K |
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Authors: | J. J. Ramírez-García M. Solache-Ríos M. Jiménez-Reyes A. Rojas-Hernández |
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Affiliation: | (1) Departamento de Química, Apdo. Postal: 18-1027, Instituto Nacional de Investigaciones Nucleares, 11801 México, D. F., México;(2) Departamento de Química, Área de Química Analítica. Apdo. Postal: 55-534, San Rafael Atlixco No. 186, Col. Vicentina 09340, Universidad Autónoma Metropolitana-Iztapalapa, México, D. F., México |
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Abstract: | The pLn-pCH diagrams obtained by a radiometric technique were used for the determination of the solubility and the first hydrolysis constants for La, Pr, Eu, Er, and Lu in 1 M NaCl ionic strength at 303 K. The saturation and unsaturation zones, and the borderline of precipitation were determined from these diagrams. The first hydrolysis constants were determined from pH titrations where no precipitation was found; these data were treated with the SUPERQUAD program. Fitting methods involving pLn versus pCH and the average ligand number vs. pCH were used to calculate both the first hydrolysis constants and the solubility products. The log Ksp values obtained for La, Pr, Eu, Er, and Lu were –19.53, –20.92, –22.24, –22.62, and –23.05 and the log* 1 average values obtained were –8.87 ± 0.05, –8.54 ± 0.04, –8.34 ± 0.03, –8.16 ± 0.04, and –8.11 ± 0.03, respectively, under CO2 free conditions. Finally, the results were compared with those found in the literature. |
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Keywords: | Lanthanides solubility hydrolysis pLn-pCH diagrams pH titration |
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