Barium sulfate
Inorganic chemical compound / From Wikipedia, the free encyclopedia
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Barium sulfate (or sulphate) is the inorganic compound with the chemical formula BaSO4. It is a white crystalline solid that is odorless and insoluble in water. It occurs as the mineral barite, which is the main commercial source of barium and materials prepared from it. Its opaque white appearance and its high density are exploited in its main applications.[4]
Quick Facts Identifiers, Properties ...
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Identifiers | |||
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3D model (JSmol) |
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ChEBI | |||
ChEMBL | |||
ChemSpider |
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DrugBank | |||
ECHA InfoCard | 100.028.896 | ||
EC Number |
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KEGG |
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PubChem CID |
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RTECS number |
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UNII | |||
UN number | 1564 | ||
CompTox Dashboard (EPA) |
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Properties | |||
BaSO4 | |||
Molar mass | 233.39 g/mol | ||
Appearance | white crystalline | ||
Odor | odorless | ||
Density | 4.49 g/cm3 | ||
Melting point | 1,580 °C (2,880 °F; 1,850 K) | ||
Boiling point | 1,600 °C (2,910 °F; 1,870 K) (decomposes) | ||
0.2448 mg/100 mL (20 °C) 0.285 mg/100 mL (30 °C) | |||
Solubility product (Ksp) |
1.0842 × 10−10 (25 °C) | ||
Solubility | insoluble in alcohol,[1] soluble in concentrated, hot sulfuric acid | ||
−71.3·10−6 cm3/mol | |||
Refractive index (nD) |
1.636 (alpha) | ||
Structure | |||
orthorhombic | |||
Thermochemistry | |||
Heat capacity (C) |
101.7 J/(mol K) | ||
Std molar entropy (S⦵298) |
132 J/(mol·K)[2] | ||
Std enthalpy of formation (ΔfH⦵298) |
−1465 kJ/mol[2] | ||
Pharmacology | |||
V08BA01 (WHO) | |||
by mouth, rectal | |||
Pharmacokinetics: | |||
negligible by mouth | |||
rectal | |||
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Hazards | |||
GHS labelling: | |||
P260, P264, P270, P273, P314, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | noncombustible[3] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)[3] | ||
REL (Recommended) |
TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)[3] | ||
IDLH (Immediate danger) |
N.D.[3] | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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