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Barium hydroxide

Barium hydroxide are chemical compounds with the chemical formula Ba(OH)2(H2O)x. The monohydrate (x =1) is known as baryta, or baryta-water, it is one of the principal compounds of barium. This white granular monohydrate is the usual commercial form.

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Further Information

Identifiers

CAS Number: 17194-00-2

JSmol: Interactive image

ChEBI: CHEBI:32592

ChemSpider: 26408

ECHA InfoCard: 100.037.470

Gmelin Reference: 846955

PubChem: 28387

RTECS number: CQ9200000

Properties

Chemical formula: Ba(OH)

Molar mass: 171.34 g/mol (anhydrous)
189.355 g/mol (monohydrate)
315.46 g/mol (octahydrate)

Appearance: white solid

Density: 3.743 g/cm (monohydrate)
2.18 g/cm (octahydrate, 16 °C)33

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)):

Solubility: low

K: 0.15 (first OH), 0.64 (second OH)––

Magnetic susceptibility: -53.2·10 cm/mol−63

Refractive index: 1.50 (octahydrate)

Structure

Crystal structure: octahedral

Thermochemistry

Std enthalpy of
formation: −944.7 kJ/mol

Hazards

Safety data sheet: See:

EU classification: Xn

R-phrases: R20/22

S-phrases: (S2) S28

NFPA 704:

Flash point: Non-flammable

Related compounds

anions: Barium oxide

cations: Calcium hydroxide

Supplementary data page

Structure and
properties: n

Thermodynamic
data: Phase behaviour

Spectral data: UV

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).