Determination of the stability of low-solubility complexonate based on pH values

Authors
Citation
I. Povar, Determination of the stability of low-solubility complexonate based on pH values, CAN J CHEM, 79(7), 2001, pp. 1166-1172
Citations number
24
Language
FRANCESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
ISSN journal
0008-4042 → ACNP
Volume
79
Issue
7
Year of publication
2001
Pages
1166 - 1172
Database
ISI
SICI code
0008-4042(200107)79:7<1166:DOTSOL>2.0.ZU;2-T
Abstract
A new method has been developed for the determination of the solubility pro duct of complexonate of known composition; because of the initial compositi on of the heterogeneous mixture (lot a), it uses only the equilibrium value s of the pH. For the determination of the stability constant in solution, t hese data have been completed with information on the solubility of the pre cipitate. We have shown that, on the basis of lot a and in the absence of r eactions of formation of complexes in solution, it is possible to evaluate the equilibrium constants, since they are residuals of the compositions of the precipitate. We conclude on the possibility of applying this method to the test and standardization of ion-selective electrodes. The qualities and defect of the method are discussed. Otherwise, the values for the equilibr ium constants and the equilibrium as well as the residual concentrations th at we have calculated for a series of real systems from known experimental data are in good accord with those reported in tables under the same condit ions.