Barium hydroxide

Barium hydroxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.037.470 Edit this at Wikidata
EC Number
  • 241-234-5
846955
RTECS number
  • CQ9200000
UNII
  • InChI=1S/Ba.2H2O/h;2*1H2/q+2;;/p-2 checkY
    Key: RQPZNWPYLFFXCP-UHFFFAOYSA-L checkY
  • InChI=1/Ba.2H2O/h;2*1H2/q+2;;/p-2
    Key: RQPZNWPYLFFXCP-NUQVWONBAR
  • [Ba+2].[OH-].[OH-]
Properties
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)
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–)[1]
−53.2·10−6 cm3/mol
1.50 (octahydrate)
Structure
octahedral
Thermochemistry[2]
−944.7 kJ·mol−1
Enthalpy of fusion (ΔfH⦵fus)
 16 kJ·mol−1
Hazards
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H302, H314, H332, H412
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
3
1
1
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
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).
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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.

  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.