Preparation and some properties of sodium thiosulfate

Author : Sevda Hasan Aliyeva

Abstract :Sodium thiostibiat is also called Schlippe’s salt. This salt is a thio compound formed by antimony (V) sulfide with sodium. One of the starting materials for the preparation of the salt, antimony (III) sulfide, was obtained fromn the Daridag antimony ore. Thermogravimnetric and chemical analyses of the composition of the Daridag antimony ore were carried out. As a result of the study, it was found that the compound is soluble in sodium hydroxide. The particle size of the sample varies between 0.12 and 0.105 mm, the ratio of antimony (II) sulfide to sodium hydroxide in the ore is 1:1.4. The process at a temperature of 343 to 362 K with a solid-liquid phase ratio of 1:6-8. The process duration is 20-25 minutes, and the yiled of antimony (III) sulfide is 97.50%. Thus, after the antimony (III) sulfide layer obtained from the sublimation of the ore was dissovled in hydrochloric acid, antimony (III) chloride was distilled and the sulfide was released. At this time, the color of the solution turned orange. İt was purified from the resulting impurities. Hydrogen antimony (III) sulfide was filtered from the antimony (III) chloride solution at room temperature through filter, paper, washed until chloride and sulfide ions were removed. The precipitate was finally washed with 50 ml of ethyl alcohol and dried at 333 K until constant mass was obtained, and prepared for the production of sodium thiostibitate. Other components were chemically pure sodium hydroxide and elemental sulfur. The reaction equation for the production of sodium thiostibitate is formulated as follows: Sb2S3 +8NaOH + 6S = 2Na3SbS4 + Na2SO4 + 4H2O The substances taken in stoichiometric proportions according to the reaction equation were mixed and heated to boiling. Heating was contunied by adding water to the mixture from time to time. After dissolution, the solution was filtered, the filtrate was evaporated sligtly and then allowed to crystallize. The obtained crystals were filtered through a Buchner funnel and dried in vacuum at room temperature. The crystals were obtained in a grayish white color. İn order to study the physicochemical properties of the sample, its thermogravimetric analysis are given in the figure below

Keywords :Sodium thiostibiate, Schlippe’s salt, antimony sulfide, thermogravimetric analysis, hydrochloric acid treatment, crystallization, ore purification, stoichiometric reaction. Ask ChatGPT

Conference Name :International Conference on Green Chemistry (ICOGC-25)

Conference Place Colombo Sri Lanka

Conference Date 30th Jun 2025