Title: Arsenic Pentasulfide

CAS Registry Number: 1303-34-0

Additional Names: Diarsenic pentasulfide

Molecular Formula: As2S5

Molecular Weight: 310.17

Percent Composition: As 48.31%, S 51.69%

Literature 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.