Barium oxide
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| Barium oxide | |
|---|---|
| Other names | Barium monoxide; barium protoxide; calcined baryta |
| Identifiers | |
| CAS number | |
| Properties | |
| Molecular formula | BaO |
| Molar mass | 153.3 g/mol |
| Appearance | white solid |
| Density | 5.7 g/cm³, solid |
| Melting point |
1923 °C |
| Boiling point |
~2000 °C |
| Solubility in water | 3.8 g/100 ml (20 °C) |
| Structure | |
| Crystal structure | cubic |
| Coordination geometry | Octahedral |
| Hazards | |
| EU classification | Harmful (Xn) |
| R-phrases | R20/22 |
| S-phrases | (S2), S28 |
| Flash point | non-flammable |
| Related Compounds | |
| Other anions | Barium hydroxide Barium peroxide |
| Other cations | Calcium oxide Strontium oxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
Barium oxide, BaO, is a white hygroscopic compound formed by the burning of barium in oxygen, although it is often formed through the decomposition of other barium salts.[1]
- 2Ba + O2 → 2BaO
- BaCO3 → BaO + CO2
It transforms into barium hydroxide on contact with water.
- BaO + H2O → Ba(OH)2
Uses
Barium oxide is used as a coating for hot cathodes, and in cathode ray tubes. It is used in the production of certain kinds of glass such as optical crown glass. It replaced lead oxide. Lead oxide was used to raise the refractive index, but it also raised the dispersive power. Barium oxide only raises the refractive index.[1] Barium oxide also has use as an ethoxylation catalyst in the reaction of ethylene oxide and alcohols, which takes place 150 and 200°C.[1]
Safety issues
Barium oxide is an irritant. If it contacts the skin or the eyes or is inhaled it causes pain and redness. However, it is more dangerous when ingested. It can cause nausea and diarrhea, muscle paralysis, cardiac arrhythmia, and can cause death. If ingested, medical attention should be sought immediately. Barium oxide also is dangerous to the environment. It is harmful especially to aquatic organisms[1]
References
External links
da:Bariumoxid de:Bariumoxid lv:Bārija oksīds ja:酸化バリウムvi:Ôxít bari
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
