Alexander V. Levanov , Fidan I. Gadziyeva , Igor Yu. Kaplin , Stepan Yu. Kupreenko , Oksana Ya. Isaikina
{"title":"烟酸铜（II）在水中的溶度积和总溶度","authors":"Alexander V. Levanov , Fidan I. Gadziyeva , Igor Yu. Kaplin , Stepan Yu. Kupreenko , Oksana Ya. Isaikina","doi":"10.1016/j.jct.2024.107311","DOIUrl":null,"url":null,"abstract":"<div><p>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, CuNic<sub>2</sub>) has been carried out. The solubility product <em>K<sub>SP</sub></em>(CuNic<sub>2</sub>) was determined from the precipitation titration curves of Cu(NO<sub>3</sub>)<sub>2</sub> solution with sodium nicotinate. The value of log<sub>10<!--> </sub><em>K<sub>SP</sub></em>(CuNic<sub>2</sub>) = –14.10 ± 0.31 was obtained, and it does not depend on temperature in the range of 14–45 °C. The total solubility of CuNic<sub>2</sub> was estimated by atomic absorption spectroscopy; in aqueous solutions with pH 6.3–6.5 containing ∼ 0.07 mol kg<sup>−1</sup> NaNic and ∼ 0.04 mol kg<sup>−1</sup> NaNO<sub>3</sub>, it is equal to (1.63 ± 0.12) × 10<sup>–5</sup> mol kg<sup>−1</sup> at a temperature of 20–25 °C. The cumulative stability constant of the CuNic<sub>2</sub>(aq) complex was estimated from the values of the solubility product and total solubility: log<sub>10<!--> </sub><em>β</em><sub>2</sub> = 9.31 ± 0.31 (20–25 °C).</p></div>","PeriodicalId":54867,"journal":{"name":"Journal of Chemical Thermodynamics","volume":"196 ","pages":"Article 107311"},"PeriodicalIF":2.2000,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Solubility product and total solubility in water of copper(II) nicotinate\",\"authors\":\"Alexander V. Levanov , Fidan I. Gadziyeva , Igor Yu. Kaplin , Stepan Yu. Kupreenko , Oksana Ya. Isaikina\",\"doi\":\"10.1016/j.jct.2024.107311\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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, CuNic<sub>2</sub>) has been carried out. The solubility product <em>K<sub>SP</sub></em>(CuNic<sub>2</sub>) was determined from the precipitation titration curves of Cu(NO<sub>3</sub>)<sub>2</sub> solution with sodium nicotinate. The value of log<sub>10<!--> </sub><em>K<sub>SP</sub></em>(CuNic<sub>2</sub>) = –14.10 ± 0.31 was obtained, and it does not depend on temperature in the range of 14–45 °C. The total solubility of CuNic<sub>2</sub> was estimated by atomic absorption spectroscopy; in aqueous solutions with pH 6.3–6.5 containing ∼ 0.07 mol kg<sup>−1</sup> NaNic and ∼ 0.04 mol kg<sup>−1</sup> NaNO<sub>3</sub>, it is equal to (1.63 ± 0.12) × 10<sup>–5</sup> mol kg<sup>−1</sup> at a temperature of 20–25 °C. The cumulative stability constant of the CuNic<sub>2</sub>(aq) complex was estimated from the values of the solubility product and total solubility: log<sub>10<!--> </sub><em>β</em><sub>2</sub> = 9.31 ± 0.31 (20–25 °C).</p></div>\",\"PeriodicalId\":54867,\"journal\":{\"name\":\"Journal of Chemical Thermodynamics\",\"volume\":\"196 \",\"pages\":\"Article 107311\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-05-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Chemical Thermodynamics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0021961424000648\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical Thermodynamics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0021961424000648","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Solubility product and total solubility in water of copper(II) nicotinate
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).
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