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 (pK_a1 = 7.56 ± 0.14; pK_a2 = 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.

中文翻译：

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草酸N'-甲苯磺酰肼乙醚理化性质

摘要

我们介绍了草酸N'-甲苯磺酰肼乙酯 (THE)理化性质的研究结果。使用分光光度法、折光法和重量法检查试剂在乙醇、0.1 mol/L KOH 溶液、甲苯、氯仿、己烷和水中的溶解度。结果表明THE 可用于浮选和萃取过程。通过分光光度法研究试剂溶液中的酸碱平衡。获得的解离常数（p K _a1 = 7.56 ± 0.14；p K _a2 = 13.48 ± 0.22）证实THE是弱二元酸。通过分光光度法研究了试剂的水解稳定性。研究结果表明，THE 溶液在碱性介质中随时间推移足够稳定，2 小时内水解率为 4.77%。通过石柱法测定试剂的表面活性，表明THE是一种表面活性剂。