Barium hydroxide

Barium hydroxide
Identifiers
CAS Number	17194-00-2 ; 22326-55-2 (monohydrate) ; 12230-71-6 (octahydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:32592 ;
ChemSpider	26408 ;
ECHA InfoCard	100.037.470
EC Number	241-234-5;
Gmelin Reference	846955
PubChem CID	28387;
RTECS number	CQ9200000;
UNII	1OHB71MYBK ; P27GID97XM (monohydrate) ; L5Q5V03TBN (octahydrate) ;
CompTox Dashboard (EPA)	DTXSID10892155 ;
	InChI InChI=1S/Ba.2H2O/h;21H2/q+2;;/p-2 Key: RQPZNWPYLFFXCP-UHFFFAOYSA-L ; InChI=1/Ba.2H2O/h;21H2/q+2;;/p-2 Key: RQPZNWPYLFFXCP-NUQVWONBAR;
	SMILES [Ba+2].[OH-].[OH-];
Properties
Chemical formula	Ba(OH)2
Molar mass	171.34 g/mol (anhydrous) ; 189.355 g/mol (monohydrate) ; 315.46 g/mol (octahydrate)
Appearance	white solid
Density	3.743 g/cm3 (monohydrate) ; 2.18 g/cm3 (octahydrate, 16 °C)
Melting point	78 °C (172 °F; 351 K) (octahydrate); 300 °C (monohydrate) ; 407 °C (anhydrous)
Boiling point	780 °C (1,440 °F; 1,050 K)
Solubility in water	mass of BaO (not Ba(OH)2): ; 1.67 g/100 mL (0 °C) ; 3.89 g/100 mL (20 °C) ; 4.68 g/100 mL (25 °C) ; 5.59 g/100 mL (30 °C) ; 8.22 g/100 mL (40 °C) ; 11.7 g/100 mL (50 °C) ; 20.94 g/100 mL (60 °C) ; 101.4 g/100 mL (100 °C)[citation needed]
Solubility in other solvents	low
Basicity (pKb)	0.15 (first OH–), 0.64 (second OH–)
Magnetic susceptibility (χ)	−53.2·10−6 cm3/mol
Refractive index (nD)	1.50 (octahydrate)
Structure
Crystal structure	octahedral
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−944.7 kJ·mol−1
Enthalpy of fusion (ΔfH⦵fus)	16 kJ·mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H332, H412
NFPA 704 (fire diamond)	3 1 1
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	308 mg/kg (rat, oral)
Safety data sheet (SDS)	Fisher Scientific
Related compounds
Other anions	Barium oxide; Barium peroxide
Other cations	Calcium hydroxide; Strontium hydroxide
Supplementary data page
	Barium hydroxide (data page)
	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 hydroxide is a chemical compound with the chemical formula Ba(OH)₂. The monohydrate (x = 1), known as baryta or baryta-water, is one of the principal compounds of barium. This white granular monohydrate is the usual commercial form.

^ "Sortierte Liste: pKb-Werte, nach Ordnungszahl sortiert. - Das Periodensystem online" (in German).
^ Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.

[1] "Sortierte Liste: pKb-Werte, nach Ordnungszahl sortiert. - Das Periodensystem online" (in German).

[2] Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.

[1]

[2]

Identifiers


CAS Number	17194-00-2^Y 22326-55-2 (monohydrate)^Y 12230-71-6 (octahydrate)^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:32592^Y
ChemSpider	26408^Y
ECHA InfoCard	100.037.470
EC Number	241-234-5
Gmelin Reference	846955
PubChem CID	28387
RTECS number	CQ9200000
UNII	1OHB71MYBK^Y P27GID97XM (monohydrate)^Y L5Q5V03TBN (octahydrate)^Y
CompTox Dashboard (EPA)	DTXSID10892155
InChI InChI=1S/Ba.2H2O/h;21H2/q+2;;/p-2^Y Key: RQPZNWPYLFFXCP-UHFFFAOYSA-L^Y InChI=1/Ba.2H2O/h;21H2/q+2;;/p-2 Key: RQPZNWPYLFFXCP-NUQVWONBAR
SMILES [Ba+2].[OH-].[OH-]
Properties
Chemical formula	Ba(OH)₂
Molar mass	171.34 g/mol (anhydrous) 189.355 g/mol (monohydrate) 315.46 g/mol (octahydrate)
Appearance	white solid
Density	3.743 g/cm³ (monohydrate) 2.18 g/cm³ (octahydrate, 16 °C)
Melting point	78 °C (172 °F; 351 K) (octahydrate) 300 °C (monohydrate) 407 °C (anhydrous)
Boiling point	780 °C (1,440 °F; 1,050 K)
Solubility in water	mass of BaO (not Ba(OH)₂): 1.67 g/100 mL (0 °C) 3.89 g/100 mL (20 °C) 4.68 g/100 mL (25 °C) 5.59 g/100 mL (30 °C) 8.22 g/100 mL (40 °C) 11.7 g/100 mL (50 °C) 20.94 g/100 mL (60 °C) 101.4 g/100 mL (100 °C)^{[citation needed]}
Solubility in other solvents	low
Basicity (pK_b)	0.15 (first OH^–), 0.64 (second OH^–)^[1]
Magnetic susceptibility (χ)	−53.2·10⁻⁶ cm³/mol
Refractive index (n_D)	1.50 (octahydrate)
Structure
Crystal structure	octahedral
Thermochemistry^[2]
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−944.7 kJ·mol⁻¹
Enthalpy of fusion (Δ_fH^⦵_fus)	16 kJ·mol⁻¹
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H332, H412
NFPA 704 (fire diamond)	3 1 1
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	308 mg/kg (rat, oral)
Safety data sheet (SDS)	Fisher Scientific
Related compounds
Other anions	Barium oxide Barium peroxide
Other cations	Calcium hydroxide Strontium hydroxide
Supplementary data page
Barium hydroxide (data page)
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