Barium sulfate

Barium sulfate
3D model of barium sulfate
Identifiers
CAS Number	7727-43-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:133326 ;
ChEMBL	ChEMBL2105897 ;
ChemSpider	22823 ;
DrugBank	DB11150;
ECHA InfoCard	100.028.896
EC Number	231-784-4;
KEGG	D02052 ;
PubChem CID	24414;
RTECS number	CR060000;
UNII	25BB7EKE2E ;
UN number	1564
CompTox Dashboard (EPA)	DTXSID0050471 ;
	InChI InChI=1S/Ba.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: TZCXTZWJZNENPQ-UHFFFAOYSA-L ; InChI=1/Ba.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: TZCXTZWJZNENPQ-NUQVWONBAD;
	SMILES [Ba+2].[O-]S([O-])(=O)=O;
Properties
Chemical formula	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)
Solubility in water	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, soluble in concentrated, hot sulfuric acid
Magnetic susceptibility (χ)	−71.3·10−6 cm3/mol
Refractive index (nD)	1.636 (alpha)
Structure
Crystal structure	orthorhombic
Thermochemistry
Heat capacity (C)	101.7 J/(mol K)
Std molar; entropy (S⦵298)	132 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−1465 kJ/mol
Pharmacology
ATC code	V08BA01 (WHO)
Routes of; administration	by mouth, rectal
	Pharmacokinetics:
Bioavailability	negligible by mouth
Excretion	rectal
Legal status	US: ℞-only;
Hazards
	GHS labelling:
Precautionary statements	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). verify (what is ?) Infobox references

Barium sulfate (or sulphate) is the inorganic compound with the chemical formula Ba SO₄. 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]

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

[1] CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. 2004. pp. 4–45. ISBN 0-8493-0485-7.

[Zumdahl,_Steven_S._2009-2] Zumdahl, Steven S. (2009). Chemical Principles (6th ed.). Houghton Mifflin Company. ISBN 978-0-618-94690-7.

[PGCH-3] NIOSH Pocket Guide to Chemical Hazards. "#0047". National Institute for Occupational Safety and Health (NIOSH).

[Holleman-4] Holleman, A. F. and Wiberg, E. (2001) Inorganic Chemistry, San Diego, CA. Academic Press, ISBN 0-12-352651-5.

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