Barium oxide

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An alkaline, white powder or mass that readily absorbs water and carbon dioxide from the air. Barium oxide is used as a dehydrating agent and as a glaze ingredient.

Synonyms and Related Terms

barium monoxide; barium protoxide; calcined baryta; heavy earth

Chemical structure

Barium oxide.jpg

Other Properties

Reacts exothermically with water to form barium hydroxide. Soluble in water, dilute acids and methanol.

Composition BaO
CAS 1304-28-5
Melting Point 1923
Density 5.7
Molecular Weight mol. wt. = 153.33
Refractive Index 1.980

Hazards and Safety

Highly toxic by ingestion. Contact with skin and membranes may cause irritation. Reaction with water can be violent.

International Chemical Safety Card

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 84
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1015
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.980

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