Solubility of some calcium-carboxylic ligand complexes in aqueous solution.
Insoluble species were identified in the systems Ca(2+)-hemimellitate, Ca(2+)-1,2,3,4-butanetetracarboxylate and Ca(2+)-citrate, and their solubilities were determined in aqueous solution at T = 25 degrees C. Values of pK(s0) were obtained for the species CaLH (L = benzene-1,2,3-tricarboxylate or hemimellitate), Ca(2)L (L = 1,2,3,4-butanetetracarboxylate), CaLH and Ca(3)L(2) (L = citrate), together with their dependence on ionic strength. Solid compounds were also characterized by thermogravimetry. The complex formation in solution for the system Na(+) - and Ca(2+)-hemimellitate was studied too.
Robertis
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Dipartimento di Chimica Inorganica, Analitica e Struttura Molecolare, Universitá, Salita Sperone 31, 1-98166 S. Agata di Messina, Italy.
Gianguzza
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Sammartano
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