Barium oxide
Chemical compound used in cathode ray tubes / From Wikipedia, the free encyclopedia
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"BaO" redirects here. For other uses, see BAO (disambiguation) and Bao (disambiguation).
Barium oxide, also known as baria, is a white hygroscopic non-flammable compound with the formula BaO. It has a cubic structure and is used in cathode ray tubes, crown glass, and catalysts. It is harmful to human skin and if swallowed in large quantity causes irritation. Excessive quantities of barium oxide may lead to death.
Quick Facts Names, Identifiers ...
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Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.013.753 |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 1884 |
CompTox Dashboard (EPA) |
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Properties | |
BaO | |
Molar mass | 153.326 g/mol |
Appearance | white solid |
Density | 5.72 g/cm3, solid |
Melting point | 1,923 °C (3,493 °F; 2,196 K) |
Boiling point | ~ 2,000 °C (3,630 °F; 2,270 K) |
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Solubility | soluble in ethanol, dilute mineral acids and alkalies; insoluble in acetone and liquid ammonia |
-29.1·10−6 cm3/mol | |
Structure | |
cubic, cF8 | |
Fm3m, No. 225 | |
Octahedral | |
Thermochemistry | |
Heat capacity (C) |
47.7 J/K mol |
Std molar entropy (S⦵298) |
70 J·mol−1·K−1[1] |
Std enthalpy of formation (ΔfH⦵298) |
−582 kJ·mol−1[1] |
Hazards | |
GHS labelling: | |
Danger | |
H301, H302, H314, H315, H332, H412 | |
P210, P220, P221, P260, P261, P264, P270, P271, P273, P280, P283, P301+P310, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P306+P360, P310, P312, P321, P330, P332+P313, P362, P363, P370+P378, P371+P380+P375, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Related compounds | |
Other anions |
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Other cations |
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Supplementary data page | |
Barium oxide (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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It is prepared by heating barium carbonate with coke, carbon black or tar or by thermal decomposition of barium nitrate.[citation needed]