Antimony pentasulfide

• Gold sulfur
• ( Di) antimony penta -sulphide

Flammable, orange to dark red powder

Fixed

4.12 g · cm -3

75 ° C ( decomposition)

Insoluble in water

Risk

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(Also known as Gold sulfur) antimony (V) - sulfide is a chemical compound of the elements antimony and sulfur. It has the formula Sb2S5, however, the exact structure is not known.

History

Antimony pentasulfide has been known since the 16th century.

Production and representation

Is produced antimony (V ) sulfide in chemical factories by decomposition of Natriumthioantimonat nonahydrate ( Schlippe'sches salt, discovered in 1821 by Karl von Schlippe ), a compound of sodium sulfide with antimony (V ) sulfide ( Na3SbS4 · 9 H2O), by very dilute sulfuric acid. Here, antimony (V ) sulfide precipitates as orange -red precipitate.

Properties

Antimony (V ) sulfide is a fine, orange-red, odorless and tasteless powder. It is insoluble in water and ethanol, and soluble in potassium hydroxide solution of ammonium sulfide solutions. In hydrochloric acid it dissolves with separation of sulfur and evolution of hydrogen sulfide of antimony (III ) chloride. When exposed to light or heating, it splits into antimony (III ) sulfide and sulfur.

Use

In comparison with the result of the antimony (III ) sulfide lower toxicity A. industrially used in part as a substitute for this. Antimony pentasulfide was earlier used for vulcanizing rubber. The thus vulcanized rubber goods were dyed red characteristic. Today it is used in matches, fireworks articles and pigments.

Application found antimony (V ) sulphide previously only medically in catarrhal diseases. This effect was, however, attributed to the previously usual impurities arsenic compounds.

Safety

Antimony (V ) sulphide must be protected from light and air are kept, otherwise oxidation occurs.