797. Arsenic Pentasulfide

Nomenclature

CAS number: 1303-34-0
Arsenic sulfide (As2S5); diarsenic pentasulfide.
As2S5; mol wt 310.17.
As 48.31%, S 51.69%.

Description and references

Prepd from H3AsO4 and H2S: Schenk in Handbook of Preparative Inorganic Chemistry vol 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 603.

Properties

Brownish-yellow, glassy, amorphous, highly refractive mass. Insol in water; sol in alkalies and alkali sulfides. Dec into As2O3, S, and As2S3 when boiled with water.

Use

In thin sheets as a light filter; in pigments.