Physico-chemical properties of ethyl ether N'-tosilhydrazide of oxalic acid

Abstract

The results of a study of the physicochemical properties of N'-tosylhydrazide oxalic acid (ETH) ethyl ester are presented. The solubility of the reagent in ethanol, 0.1 mol/l KOH solution, toluene, chloroform, hexane, and water was studied by spectrophotometry, refractometry, and gravimetry. Based on the results obtained, it was shown that ETG can be used in flotation and extraction processes. Acid-base equilibria in reagent solutions were studied by spectrophotometric method. The obtained values of acid dissociation constants (pKa1=7.56 ± 0.14; pKa2=13.48 ± 0.22) prove that ETG is a weak dibasic acid. The hydrolytic stability of the reagent was studied by the spectrophotometric method. The results of the study showed that ETG solutions are quite stable in time in alkaline media: the degree of hydrolysis for two hours is 4.77%. The surface activity of the reagent was determined by the stalagmometric method. ETG has been found to be a surfactant.