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Topic summary

Barium sulfate

Barium sulfate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard100.028.896EC Number
  • 231-784-4
KEGG
RTECS number
  • CR060000
UNII
UN number1564
  • InChI=1S/Ba.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
    Key: TZCXTZWJZNENPQ-UHFFFAOYSA-L
  • [Ba+2].[O-]S([O-])(=O)=O
Properties BaSO4Molar mass233.39 g/mol Appearance white crystalline Odorodorless Density4.49 g/cm Melting point1,580 °C (2,880 °F; 1,850 K) Boiling point1,600 °C (2,910 °F; 1,870 K) (decomposes)
  • 2.448 mg/L (20 °C)
  • 2.85 mg/L (30 °C)
1.0842 × 10 (25 °C) Solubilitysoluble in concentrated, hot sulfuric acidSolubility in ethanolInsoluble −71.3·10 cm/mol 1.636 (alpha) Structure orthorhombic Thermochemistry 101.7 J/(mol K) 132 J/(mol·K) −1465 kJ/mol Pharmacology V08BA01 (WHO) by mouth, rectal Pharmacokinetics: negligible by mouth rectal Legal status
Hazards GHS labelling: P260, P264, P270, P273, P314, P501NFPA 704 (fire diamond)
0
0
0
Flash pointnoncombustible NIOSH (US health exposure limits):
PEL (Permissible)
TWA 15 mg/m (total) TWA 5 mg/m (resp)
REL (Recommended)
TWA 10 mg/m (total) TWA 5 mg/m (resp)
IDLH (Immediate danger)
N.D.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Barium sulfate is the inorganic compound with the chemical formula BaSO4. It is a white crystalline solid that is odorless and insoluble in water. It occurs in nature 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.

Wikipedia source