|Preferred IUPAC name
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||246.02 g·mol−1|
|Density||3.43 g cm−3|
|Melting point||310 °C (590 °F; 583 K)|
|Boiling point||707 °C (1,305 °F; 980 K)|
|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°
exposure limit (PEL)
|[1910.1018] TWA 0.010 mg/m3|
|Other anions||Arsenic trioxide|
|Other cations||Phosphorus trisulfide|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Arsenic trisulfide, also known as orpiment or arsenic(III) sulfide, is a chemical compound. Its chemical formula is As2S3. It has arsenic and sulfide ions in it. The arsenic is in its +3 oxidation state.
Properties[change | change source]
Arsenic trisulfide is a yellow solid. It is a semiconductor. It has a glass (amorphous) form and a crystalline form. It burns in air to make sulfur dioxide and arsenic trioxide, which makes a highly toxic smoke. Arsenic trisulfide can oxidize on the surface to make a highly toxic layer of arsenic trioxide as well. Arsenic trisulfide is not toxic unless it oxidizes. It does not react with acids.
Occurrence[change | change source]
Preparation[change | change source]
Uses[change | change source]
References[change | change source]
- Mullen, D. J. E.; Nowacki, W (1972), "Refinement of the crystal structures of realgar, AsS and orpiment, As2S3" (PDF), Z. Kristallogr., 136: 48–65, doi:10.1524/zkri.1972.136.1-2.48.