Barium peroxide
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| UN number | 1449 |
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| Template:Longitem | Template:Chem2 |
| Molar mass | 169.33 g/mol (anhydrous) 313.45 g/mol (octahydrate) |
| Appearance | Grey-white crystalline solid (anhydrous) Colorless solid (octahydrate) |
| Odor | Odorless |
| Density | 5.68 g/cm3 (anhydrous) 2.292 g/cm3 (octahydrate) |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Solubility | dissolves with decomposition in acid |
| Template:Longitem | −40.6·10−6 cm3/mol |
| Template:Longitem | Tetragonal[2] |
| Template:Longitem | D174h, I4/mmm, tI6 |
| Template:Longitem | 6 |
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Barium peroxide is an inorganic compound with the formula Template:Chem2. This white solid (gray when impure) is one of the most common inorganic peroxides, and it was the first peroxide compound discovered. Being an oxidizer and giving a vivid green colour upon ignition (as do all barium compounds), it finds some use in fireworks; historically, it was also used as a precursor for hydrogen peroxide.[3]
Structure
Barium peroxide consists of barium cations Template:Chem2 and peroxide anions Template:Chem2. The solid is isomorphous to calcium carbide, Template:Chem2.
Preparation and use
Barium peroxide arises by the reversible reaction of Template:Chem2 with barium oxide. The peroxide forms around 500 °C and oxygen is released above 820 °C.[1]
This reaction is the basis for the now-obsolete Brin process for separating oxygen from the atmosphere. Other oxides, e.g. [[Sodium oxide|Template:Chem2]] and SrO, behave similarly.[4]
In another obsolete application, barium peroxide was once used to produce hydrogen peroxide via its reaction with sulfuric acid:[3]
The insoluble barium sulfate is filtered from the mixture.
Footnotes
- ↑ a b Accommodation of Excess Oxygen in Group II Monoxides - S.C. Middleburgh, R.W. Grimes and K.P.D. Lagerlof Journal of the American Ceramic Society 2013, Volume 96, pages 308–311. Script error: No such module "CS1 identifiers".
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- ↑ a b Template:Ullmann
- ↑ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. Template:ISBN.