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Names | |
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IUPAC name
Diboron trioxide
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Other names
boron oxide, diboron trioxide, boron sesquioxide, boric oxide, boria
Boric anhydride | |
Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.013.751 |
EC Number |
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11108 | |
PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
B2O3 | |
Molar mass | 69.6182 g/mol |
Appearance | white, glassy solid |
Density | 2.460 g/cm3, liquid; 2.55 g/cm3, trigonal; |
Melting point | 450 °C (842 °F; 723 K) (trigonal) 510 °C (tetrahedral) |
Boiling point | 1,860 °C (3,380 °F; 2,130 K) ,[2] sublimes at 1500 °C[3] |
1.1 g/100mL (10 °C) 3.3 g/100mL (20 °C) 15.7 g/100mL (100 °C) | |
Solubility | partially soluble in methanol |
Acidity (pKa) | ~ 4 |
−39.0·10−6 cm3/mol | |
Thermochemistry | |
Heat capacity (C)
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66.9 J/(mol⋅K) |
Std molar
entropy (S⦵298) |
80.8 J/(mol⋅K) |
Std enthalpy of
formation (ΔfH⦵298) |
−1254 kJ/mol |
Gibbs free energy (ΔfG⦵)
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−832 kJ/mol |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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Irritant[4] |
GHS labelling: | |
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Danger | |
H360FD | |
P201, P202, P281, P308+P313, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | noncombustible |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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3163 mg/kg (oral, mouse)[5] |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 15 mg/m3[4] |
REL (Recommended)
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TWA 10 mg/m3[4] |
IDLH (Immediate danger)
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2000 mg/m3[4] |
Supplementary data page | |
Boron 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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Boron trioxide or diboron trioxide is the oxide of boron with the formula B2O3. It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty. It is also called boric oxide[6] or boria.[7] It has many important industrial applications, chiefly in ceramics as a flux for glazes and enamels and in the production of glasses.
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