Barium Hydroxide

Title: Barium Hydroxide
CAS Registry Number: 17194-00-2
Additional Names: Barium dihydroxide; activated barium hydroxide; caustic baryta
Molecular Formula: BaH2O2
Molecular Weight: 171.34
Percent Composition: Ba 80.15%, H 1.18%, O 18.68%
Line Formula: Ba(OH)2
Literature References: Reacts as base/nucleophile in organic syntheses. Prepn: Gmelins, Barium (8th ed) 30, 106-111 and suppl. 175-177, 289 (1960). Thermal dehydration and decomposition study: G. M. Habashy, G. A. Kolta, J. Inorg. Nucl. Chem. 34, 57 (1972). Use as a catalyst in organic synthesis: J. Barrios et al., J. Catal. 112, 528 (1988); I. Paterson et al., Synlett 1993, 774; Y.-D. Gong et al., J. Org. Chem. 63, 4854 (1998); R. S. Varma et al., Tetrahedron Lett. 39, 8437 (1998). Review of synthetic applications: S. Jeanmart, Synlett 2002, 1739-1740. Review of toxicology and human exposure: Toxicological Profile for Barium and Compounds (PB93-110658, 1992) 163 pp.
Derivative Type: Monohydrate
CAS Registry Number: 22326-55-2
Additional Names: Dried barium hydroxide
Molecular Formula: BaH2O2.H2O
Molecular Weight: 189.36
Percent Composition: Ba 72.52%, H 2.13%, O 25.35%
Properties: Obtained by heating commercial Ba(OH)2.8H2O at 200°. White powder. Poisonous! d 3.743. Slightly sol in water; sol in dil acids.
Density: d 3.743
Derivative Type: Octahydrate
CAS Registry Number: 12230-71-6
Molecular Formula: BaH2O2.8H2O
Molecular Weight: 315.46
Percent Composition: Ba 43.53%, H 5.75%, O 50.72%
Properties: Most common form of the hydroxide, readily available commerically. Transparent crystals or white masses. Very alkaline; rapidly absorbs CO2 from air, becoming incompletely sol in water. Poisonous! mp 78°. Freely sol in water, methanol; slightly sol in ethanol. Practically insol in acetone. Keep tightly closed.
Melting point: mp 78°
Use: In manuf of alkali, glass; in synthetic rubber vulcanization, in corrosion inhibitors, pesticides, sugar industry; boiler scale remedy; refining animal and vegetable oils; softening water. Catalyst in organic synthesis.
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