Arsenic trisulfide
| Arsenic trisulfide | |
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Arsenic trisulfide
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| Other names | Arsenic(III) sulfide Orpiment |
| Identifiers | |
| CAS number | |
| PubChem | |
| EC number | 215-117-4 |
| RTECS number | CG2638000 |
| SMILES | S1[As]3S[As]2S[As](S[As]1S2)S3 |
| Properties | |
| Molecular formula | As2S3 |
| Molar mass | 246.04 g mol-1 |
| Appearance | Orange crystals |
| Density | 3.43 g cm-3 |
| Melting point |
310 °C, 583 K, 590 °F |
| Boiling point |
707 °C, 980 K, 1305 °F |
| Hazards | |
| EU Index | 033-002-00-5 |
| NFPA 704 |
0
3
0
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| U.S. Permissible exposure limit (PEL) |
0.01 mg m−3 TWA (as As) |
| Related compounds | |
| Other anions | Arsenic trioxide Arsenic triselenide |
| Other cations | Phosphorus trisulfide Antimony trisulfide Bismuth sulfide |
| Related compounds | Tetraarsenic tetrasulfide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
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.
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Properties [change]
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]
Arsenic trisulfide is found as the mineral orpiment.
Preparation [change]
Arsenic trisulfide is made when an arsenic compound like arsenic trichloride reacts with hydrogen sulfide. It is also made when arsenic and sulfur are heated together.
Uses [change]
It was looked at for treating cancer. It was used by the Egyptians as a pigment and cosmetic. It is used in glass.
