Chromium(III) sulfide
| Identifiers | |
|---|---|
12018-22-3  | |
| ECHA InfoCard | 100.031.477 |
| EC Number | 234-638-8 |
| PubChem | 159397 |
| Properties | |
| Cr2S3 | |
| Molar mass | 200.19 g/mol |
| Appearance | Brown to black powder |
| Odor | odorless |
| Density | 3.77 g/cm3 |
| Melting point | 1350 °C |
| insoluble | |
| Hazards | |
| Safety data sheet | |
| NFPA 704 | |
| US health exposure limits (NIOSH): | |
| PEL (Permissible) |
TWA 1 mg/m3[1] |
| REL (Recommended) |
TWA 0.5 mg/m3[1] |
| IDLH (Immediate danger) |
250 mg/m3[1] |
| Related compounds | |
| Other anions |
Chromium(III) oxide |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Chromium(III) Sulfide is the sulfide salt of trivalent chromium.
Preparation
It may be formed by the reaction of hydrogen sulfide with chromium(III) oxide or other chromium salts.
Properties
Chromium(III) sulfide appears as a brownish black powder that melts at 1350 C. It is essentially insoluble in water.[2] When heated sufficiently, it will oxidize in the presence of air or oxygen, though it is otherwise fairly stable.
Health effects
Chromium (VI) is a confirmed carcinogen in humans. Because chromium(III) sulfide is fairly insoluble in water, it is much less toxic than other chromium compounds. However, in-vivo oxidation of chromium(III) to chromium(VI) can render it highly toxic and carcinogenic. As with all chromium-containing species, care must be taken to avoid ingestion of chromium(III) sulfide.