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Names | |
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Preferred IUPAC name
Arsenic trisulfide | |
Other names
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.013.744 |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
As2S3 | |
Molar mass | 246.02 g·mol−1 |
Appearance | yellow or orange crystals |
Density | 3.43 g/cm3 |
Melting point | 310 °C (590 °F; 583 K) |
Boiling point | 707 °C (1,305 °F; 980 K) |
insoluble | |
Solubility | soluble in ammonia |
−70.0·10−6 cm3/mol | |
Structure[1] | |
monoclinic | |
P21/n (No. 11) | |
a = 1147.5(5) pm, b = 957.7(4) pm, c = 425.6(2) pm α = 90°, β = 90.68(8)°, γ = 90°
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pyramidal (As) | |
Hazards | |
GHS labelling:[3][4] | |
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Danger | |
H300, H331, H400, H411 | |
NFPA 704 (fire diamond) | |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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[1910.1018] TWA 0.010 mg/m3[2] |
REL (Recommended)
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Ca C 0.002 mg/m3 [15-minute][2] |
IDLH (Immediate danger)
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Ca [5 mg/m3 (as As)][2] |
Related compounds | |
Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Arsenic trisulfide is the inorganic compound with the formula As2S3. It is a dark yellow solid that is insoluble in water. It also occurs as the mineral orpiment (Latin: auripigmentum), which has been used as a pigment called King's yellow. It is produced in the analysis of arsenic compounds. It is a group V/VI, intrinsic p-type semiconductor and exhibits photo-induced phase-change properties.[clarification needed]