Barium sulfate

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.

Barium sulfate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.028.896
EC Number
  • 231-784-4
KEGG
RTECS number
  • CR060000
UNII
UN number 1564
  • InChI=1S/Ba.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Y
    Key: TZCXTZWJZNENPQ-UHFFFAOYSA-L Y
  • InChI=1/Ba.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
    Key: TZCXTZWJZNENPQ-NUQVWONBAD
  • [Ba+2].[O-]S([O-])(=O)=O
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)
1.0842 × 10−10 (25 °C)
Solubility insoluble in alcohol, soluble in concentrated, hot sulfuric acid
−71.3·10−6 cm3/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, P501
NFPA 704 (fire diamond)
0
0
0
Flash point noncombustible
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
REL (Recommended)
 TWA 10 mg/m3 (total) TWA 5 mg/m3 (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).
N verify (what is YN ?)
Infobox references
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