Arsenic pentasulfide

Arsenic pentasulfide (arsenic(V) sulfide), As S q, is stable in air up to 95°C, but at higher temperatures begins to dissociate into arsenous sulfide and sulfur. It is prepared by the fusion of arsenic with sulfur foUowed by extraction with ammonia and reprecipitation at low temperatures by addition of hydrochloric acid. Arsenic pentasulfide is precipitated at low temperatures from strongly acidic arsenate solutions by a rapid stream of hydrogen sulfide. It is hydrolyzed by boiling with water, yielding arsenous acid and sulfur. Salts derived from a number of thioarsenic acids are formed from arsenic pentasulfide and alkaH metal sulfides. 

Arsenic pentasulfide is used as pigment and as a hght filter in thin sheets. 

Arsenic pentasulfide is prepared by precipitation from an acidic solution of orthoarsenic acid, H3ASO4, or arsenic pentachloride, AsCls or any other soluble As(V) salt by passing hydrogen sulfide. It may be also prepared by heating a mixture of arsenic and sulfur, extracting the fused mass with ammonia solution and reprecipitating arsenic pentasulfide at low temperature hy addition of HCl. 

Arsenic pentasulfide hydrolyzes in boiling water, giving arsenous acid, HsAsOs and sulfur ... 

It oxidizes in air at elevated temperatures producing arsenic oxides, the products and yields of which depend on the air supply. In alkali metal sulfide solutions arsenic pentasulfide forms thioarsenate anion, [AsS4] and its alkali metal salts, e.g., NasAsS4. 

TRICHLORO-s-TRIAZINETRIONE or TRICHLORO-s-TRIAZINE-2,4,6(lEr,3, 5H)-TRIONE or 1,3,5-TRICHLORO-l,2,5-TRIAZINE-2,4,6(m,3, 5fO-TRIONE or 1,3,5-TRICHLORO-s-TRIAZINE-2,4,6(m,3, 5fl)-TRIONE (87-90-1) or TRICHLORO-5-TRIAZINETRIONE (87-90-1) C3CI3N3O3 Reacts with water releasing toxic chlorine gas. A powerful oxidizer accelerates the burning of combustible materials. Violent reaction with reducing agents, including hydrides, nitrides, and sulfides ammonium compounds combustible materials organic compounds powdered aluminum and other metals hydrated salts. Reacts with acrolein, antimony trisulfide, antimony tritelluride, arsenic pentasulfide, 1,1 -dichloro-1 -... 

BICHROMATE de SODIUM (French) (10588-01-9) A strong oxidizer. Reacts violently with reducing agents, acids, acetic anhydride, hydrazine, combustible materials, organic substances, metal powders. Reacts with acrolein, antimony trisulfide, antimony tritelluride, arsenic pentasulfide, 1,1-dichloro-l-nitroethane, 1,3-dichloropropene, diethylamine, fluorine, hydrazine, potassium iodide, sodium tetraborate, sodium tetraborate decahydrate, sodium borohydride, zirconium dusts, s-trioxane. Incompatible with m-bis(trichlormethyl)benzene, hydroxylamine. Aqueous solution is caustic incompatible with acids, alcohols, aldehydes, alkylene oxides, cresols, caprolactam solution, epichlorohydrin, organic anhydrides, glycols, maleic anhydride, phenols. Attacks aluminum copper, brass, bronze, tin, zinc, especially in the presence of moisture. 

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