Determinacion de las constantes de hidrolisis y de los complejos con carbonatos del Praseodimio (III), en medio de fuerza ionica 2M de cloruro de sodio, a 303 K. (Determination of formation constants of hydroxo carbonate complexes of Pr(sup 3+) in 2M NaCl at 303 K)
(English)
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The hydrolysis of Praseodymium III in 2M sodium chloride at 303 K was studied. Two methods were used: pH titration followed by a computational refinement and solvent extraction in the presence of a competitive ligand. The hydrolysis constants obtained by pH titration were: log (beta)(sub 1,H) = -7.68 (+-) 0.07, log (beta)(sub 1,2H) = -15.10 (+-) 0.03, and (beta)(sub 1,3H) -23.8 (+-) 0.04. The stability constants of Praseodymium carbonates were determined by pH titration as well and were: log (beta)(sub 1,CO3)(sup 2-) = 5.94 (+-) 0.08 and log (beta)(sub 1,2CO3)(sup 2-) = 11.15 (+-) 0.15. Praseodymium carbonate species were taken into consideration for calculating the first hydrolysis constants by the solvent extraction method and the value obtained was: log (beta)(sub 1,H) = -7.69 (+-) 0.27. The values for log (beta)(sub 1,H) attained by both methods are the same. The species-distribution diagram was obtained from the stability constants of Praseodymium carbonates and hydrolysis products in the conditions of the present work. (Author). (Atomindex citation 28:070955)
Determinacion de las constantes de hidrolisis y de los complejos con carbonatos del Praseodimio (III), en medio de fuerza ionica 2M de cloruro de sodio, a 303 K. (Determination of formation constants of hydroxo carbonate complexes of Pr(sup 3+) in 2M NaCl at 303 K)