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

IF 2.2 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Journal of Chemical Thermodynamics Pub Date : 2024-05-15 DOI:10.1016/j.jct.2024.107311

Alexander V. Levanov , Fidan I. Gadziyeva , Igor Yu. Kaplin , Stepan Yu. Kupreenko , Oksana Ya. Isaikina

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Abstract

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 K_SP(CuNic₂) was determined from the precipitation titration curves of Cu(NO₃)₂ solution with sodium nicotinate. The value of log₁₀K_SP(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: log₁₀β₂ = 9.31 ± 0.31 (20–25 °C).

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烟酸铜（II）在水中的溶度积和总溶度

根据铜指示电极的沉淀电位滴定数据，提出并证实了一种确定稀溶性铜（II）盐溶度积的方法。首次对烟酸铜（II）（吡啶-3-羧酸盐，CuNic2）在水介质中的溶解度进行了系统研究。溶度积 KSP(CuNic2) 是根据 Cu(NO3)2 溶液与烟酸钠的沉淀滴定曲线确定的。得到的 log10 KSP(CuNic2) = -14.10 ± 0.31，在 14-45 °C 范围内与温度无关。CuNic2 的总溶解度是通过原子吸收光谱法估算的；在 pH 值为 6.3-6.5 的水溶液中，含有 ∼ 0.07 mol kg-1 NaNic 和 ∼ 0.04 mol kg-1 NaNO3，温度为 20-25 °C 时，总溶解度等于 (1.63 ± 0.12) × 10-5 mol kg-1。根据溶度积和总溶度的值估算出 CuNic2（aq）复合物的累积稳定常数：log10 β2 = 9.31 ± 0.31（20-25 °C）。

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来源期刊

Journal of Chemical Thermodynamics 工程技术-热力学

CiteScore

5.60

自引率

15.40%

发文量

199

审稿时长

79 days

期刊介绍： The Journal of Chemical Thermodynamics exists primarily for dissemination of significant new knowledge in experimental equilibrium thermodynamics and transport properties of chemical systems. The defining attributes of The Journal are the quality and relevance of the papers published. The Journal publishes work relating to gases, liquids, solids, polymers, mixtures, solutions and interfaces. Studies on systems with variability, such as biological or bio-based materials, gas hydrates, among others, will also be considered provided these are well characterized and reproducible where possible. Experimental methods should be described in sufficient detail to allow critical assessment of the accuracy claimed. Authors are encouraged to provide physical or chemical interpretations of the results. Articles can contain modelling sections providing representations of data or molecular insights into the properties or transformations studied. Theoretical papers on chemical thermodynamics using molecular theory or modelling are also considered. The Journal welcomes review articles in the field of chemical thermodynamics but prospective authors should first consult one of the Editors concerning the suitability of the proposed review. Contributions of a routine nature or reporting on uncharacterised materials are not accepted.