Barium carbonate

Barium carbonate
Names
	Other names Witherite
Identifiers
CAS Number	513-77-9 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:190439;
ChemSpider	10121 ;
ECHA InfoCard	100.007.426
EC Number	208-167-3;
PubChem CID	10563;
RTECS number	CQ8600000;
UNII	6P669D8HQ8 ;
UN number	1564
CompTox Dashboard (EPA)	DTXSID1029623 ;
	InChI InChI=1S/CH2O3.Ba/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: AYJRCSIUFZENHW-UHFFFAOYSA-L ; InChI=1/CH2O3.Ba/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: AYJRCSIUFZENHW-NUQVWONBAT;
	SMILES [Ba+2].[O-]C([O-])=O; C(=O)([O-])[O-].[Ba+2];
Properties
Chemical formula	BaCO3
Molar mass	197.335 g·mol−1
Appearance	white crystals
Odor	odorless
Density	4.286 g/cm3
Melting point	811 °C (1,492 °F; 1,084 K) polymorphic transformation
Boiling point	1,450 °C (2,640 °F; 1,720 K) decomposes from 1,360 °C (2,480 °F; 1,630 K)
Solubility in water	16 mg/L (8.8 °C (47.8 °F; 281.9 K)); 22 mg/L (18 °C (64 °F; 291 K)); 24 mg/L (20 °C (68 °F; 293 K)); 24 mg/L (24.2 °C (75.6 °F; 297.3 K));
Solubility product (Ksp)	2.58×10−9
Solubility in acid	decomposes
Magnetic susceptibility (χ)	−58.9×10−6 cm3/mol
Refractive index (nD)	1.676
Structure
Crystal structure	orthorhombic
Thermochemistry
Heat capacity (C)	85.35 J/mol·K
Std molar; entropy (S⦵298)	112 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−1219 kJ/mol
Gibbs free energy (ΔfG⦵)	−1139 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302
Precautionary statements	P264, P270, P301+P312+P330, P501
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	418 mg/kg, oral (rat)
	NIOSH (US health exposure limits):
REL (Recommended)	0.5 mg/m3
Safety data sheet (SDS)	Sigma-Aldrich
Related compounds
Other anions	Barium chlorate; Barium chloride; Barium chromate; Barium perchlorate; Barium peroxide; Barium sulfate;
Other cations	Beryllium carbonate; Magnesium carbonate; Calcium carbonate; Strontium carbonate; Radium carbonate;
	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 carbonate is the inorganic compound with the formula BaCO₃. Like most alkaline earth metal carbonates, it is a white salt that is poorly soluble in water. It occurs as the mineral known as witherite. In a commercial sense, it is one of the most important barium compounds.