Solubility product and total solubility in water of copper(II) nicotinate

Levanov, A.V.; Gadziyeva, F.I.; Kaplin, I.Y.; Kupreenko, S.Y.; Isaikina, O.Y.

Авторы: Levanov Alexander V., Gadziyeva Fidan I., Kaplin Igor Yu, Kupreenko Stepan Yu, Isaikina Oksana Ya
Журнал: Journal of Chemical Thermodynamics
Том: 196
Год издания: 2024
Издательство: Academic Press
Местоположение издательства: United States
Номер статьи: 107311
DOI: 10.1016/j.jct.2024.107311
Аннотация: A method for determining the solubility product of sparingly soluble copper (II) salts based on the data of precipitation potentiometric titration with a copper indicator electrode is proposed and substantiated. For the first time, a systematic study of the solubility in aqueous media of copper (II) nicotinate (pyridine-3-carboxylate, CuNic2) has been carried out. The solubility product KSP(CuNic2) was determined from the precipitation titration curves of Cu(NO3)2 solution with sodium nicotinate. The value of log10 KSP(CuNic2) = –14.10 ± 0.31 was obtained, and it does not depend on temperature in the range of 14–45 °C. The total solubility of CuNic2 was estimated by atomic absorption spectroscopy; in aqueous solutions with pH 6.3–6.5 containing ∼ 0.07 mol kg−1 NaNic and ∼ 0.04 mol kg−1 NaNO3, it is equal to (1.63 ± 0.12) × 10–5 mol kg−1 at a temperature of 20–25 °C. The cumulative stability constant of the CuNic2(aq) complex was estimated from the values of the solubility product and total solubility: log10 β2 = 9.31 ± 0.31 (20–25 °C).
Добавил в систему: Купреенко Степан Юрьевич

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