Barium sulfate

Barium sulfate
Chemical structure of barium sulfate
3D model of barium sulfate
3D model of barium sulfate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.028.896 Edit this at Wikidata
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 checkY
    Key: TZCXTZWJZNENPQ-UHFFFAOYSA-L checkY
  • 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,[1] 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)[2]
−1465 kJ/mol[2]
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)
NFPA 704 four-colored diamondHealth 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chlorideFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
0
0
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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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 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.[4]

  1. ^ CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. 2004. pp. 4–45. ISBN 0-8493-0485-7.
  2. ^ a b Zumdahl, Steven S. (2009). Chemical Principles (6th ed.). Houghton Mifflin Company. ISBN 978-0-618-94690-7.
  3. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0047". National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Holleman, A. F. and Wiberg, E. (2001) Inorganic Chemistry, San Diego, CA. Academic Press, ISBN 0-12-352651-5.