Antimony trioxide
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Antimony(III) oxide is the inorganic compound with the formula Sb2O3. It is the most important commercial compound of antimony. It is found in nature as the minerals valentinite and senarmontite.[3] Like most polymeric oxides, Sb2O3 dissolves in aqueous solutions with hydrolysis. A mixed arsenic-antimony oxide occurs in nature as the very rare mineral stibioclaudetite.[4][5]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Antimony(III) oxide | |
Other names | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.013.796 |
EC Number |
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KEGG |
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RTECS number |
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Properties | |
Sb2O3 | |
Molar mass | 291.518 g/mol |
Appearance | white solid |
Odor | odorless |
Density | 5.2 g/cm3, α-form 5.67 g/cm3 β-form |
Melting point | 656 °C (1,213 °F; 929 K) |
Boiling point | 1,425 °C (2,597 °F; 1,698 K) (sublimes) |
370±37 μg/L between 20.8 °C and 22.9 °C | |
Solubility | soluble in acid |
−69.4×10−6 cm3/mol | |
Refractive index (nD) |
2.087, α-form 2.35, β-form |
Structure | |
cubic (α) < 570 °C orthorhombic (β) > 570 °C | |
pyramidal | |
zero | |
Hazards | |
GHS labelling: | |
[1] | |
Warning[1] | |
H351[1] | |
P281[1] | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
7000 mg/kg, oral (rat) |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.5 mg/m3 (as Sb)[2] |
REL (Recommended) |
TWA 0.5 mg/m3 (as Sb)[2] |
Related compounds | |
Other anions |
Antimony trisulfide Antimony triselenide Antimony telluride |
Other cations |
Dinitrogen trioxide Phosphorus trioxide Arsenic trioxide Bismuth trioxide |
Related compounds |
Diantimony tetraoxide Antimony pentoxide |
Supplementary data page | |
Antimony trioxide (data page) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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