Title: Arsenic Trisulfide
CAS Registry Number: 1303-33-9
Additional Names: Yellow arsenic sulfide; orpiment; auripigment; arsenic yellow; king's yellow; king's gold
Molecular Formula: As2S3
Molecular Weight: 246.04
Percent Composition: As 60.90%, S 39.10%
Literature References: The article of commerce contains much less sulfur than theory. Prepn: Gmelins, Arsenic (8th ed.) 17, pp 422-433 (1952).
Properties: Yellow or orange powder. mp reported from 300 to 325°. d 3.46. Practically insol in water. Sol in alkalies, alkali sulfides or carbonates; slowly sol in hot HCl; dec by HNO3.
Melting point: mp reported from 300 to 325°
Density: d 3.46
Use: Manuf of glass, particularly infrared-transmitting glass; manuf of oil cloth, linoleum; in electrical semiconductors, photoconductors; as pigment; for depilating hides; in pyrotechnics.