Studying physical and chemical properties N-nonail-N'-(2-naphthylsulphonyl)hydrazine

Abstract

The results of a study of the physicochemical properties of N-nonyl-N'-(2-naphthylsulfonyl)hydrazine (NSH) are presented. The solubility of the reagent in ethanol, 0,1 mol/l KOH solution, toluene, chloroform, and hexane was studied using spectrophotometry, refractometry and gravimetry. Based on the results of the study, it was shown that NSG can be used in flotation and extraction processes. Protolytic equilibria in reagent solutions were studied using the spectrophotometric method. The obtained values of acid dissociation constants (pKa1=8,33±0,08; pKa2=13,15±0,10) prove that NSH is a weak dibasic acid. In order to use the reagent in concentration processes, the stability of the reagent in a 0,1 mol/l KOH solution was studied using the spectrophotometric method. The results of the study showed that NSH solutions are quite stable over time in alkaline media: the degree of hydrolysis within 30 min is 1,41%. The surface activity of the reagent was determined using the stalagmometric method. It has been established that NSH is a surfactant.