Yu. B. Elchishcheva, O. A. Posokhina, P. T. Pavlov
{"title":"Physical and Chemical Properties of Oxalic Acid N'-Tosylhydrazide Ethyl Ether","authors":"Yu. B. Elchishcheva, O. A. Posokhina, P. T. Pavlov","doi":"10.1134/s2634827623600159","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We present the results of the investigation of the physicochemical properties of oxalic acid <i>N</i>'-tosylhydrazide ethyl ester (THE). The solubility of the reagent was examined in ethanol, 0.1 mol/L KOH solution, toluene, chloroform, hexane, and water using spectrophotometry, refractometry, and gravimetry. The results suggest that THE can be useful in flotation and extraction processes. Acid–base equilibria in the reagent solutions were studied by spectrophotometric methods. The obtained dissociation constants (p<i>K</i><sub>a1</sub> = 7.56 ± 0.14; p<i>K</i><sub>a2</sub> = 13.48 ± 0.22) confirm that THE is a weak dibasic acid. The hydrolytic stability of the reagent was investigated spectrophotometrically. The research findings indicate that THE solutions are sufficiently stable over time in alkaline media, with a hydrolysis rate of 4.77% over 2 h. The surface activity of the reagent was determined by the stalagmometric method, revealing that THE is a surfactant.</p>","PeriodicalId":21086,"journal":{"name":"Reviews and Advances in Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reviews and Advances in Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s2634827623600159","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We present the results of the investigation of the physicochemical properties of oxalic acid N'-tosylhydrazide ethyl ester (THE). The solubility of the reagent was examined in ethanol, 0.1 mol/L KOH solution, toluene, chloroform, hexane, and water using spectrophotometry, refractometry, and gravimetry. The results suggest that THE can be useful in flotation and extraction processes. Acid–base equilibria in the reagent solutions were studied by spectrophotometric methods. The obtained dissociation constants (pKa1 = 7.56 ± 0.14; pKa2 = 13.48 ± 0.22) confirm that THE is a weak dibasic acid. The hydrolytic stability of the reagent was investigated spectrophotometrically. The research findings indicate that THE solutions are sufficiently stable over time in alkaline media, with a hydrolysis rate of 4.77% over 2 h. The surface activity of the reagent was determined by the stalagmometric method, revealing that THE is a surfactant.
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