Potassium hyperoxide
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Potassium hyperoxide | ||||||||||||||||||
other names |
Potassium peroxide |
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Molecular formula | KO 2 | ||||||||||||||||||
Brief description |
yellow solid |
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properties | |||||||||||||||||||
Molar mass | 71,10 g · mol -1 | ||||||||||||||||||
Physical state |
firmly |
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density |
2.14 g cm −3 |
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Melting point |
380 ° C |
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solubility |
Violent decomposition in water |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Potassium hyperoxide or potassium superoxide (KO 2 ) is a yellow, salty chemical compound and is one of the hyperoxides .
Properties and use
The yellow salt decomposes vigorously in water with the formation of potassium hydroxide , hydrogen peroxide and oxygen .
- Potassium hyperoxide reacts with water to form potassium hydroxide and oxygen.
- Potassium hyperoxide reacts with water to form potassium hydroxide and hydrogen peroxide.
Potassium hyperoxide has the ability to bind water vapor and carbon dioxide and release oxygen to the environment.
- Potassium hyperoxide reacts with carbon dioxide and water vapor to form potassium hydrogen carbonate and oxygen.
Since both carbon dioxide and water are released during breathing, it can therefore be used, for example, in space stations , submarines or in breathing rescue devices to regenerate the air you breathe.
In addition to potassium hyperoxide, sodium peroxide (Na 2 O 2 ) is also used to replace carbon dioxide with oxygen .
The standard enthalpy of formation of potassium hyperoxide is ΔH f 0 = -285 kJ / mol.
presentation
Potassium hyperoxide is made by heating potassium in a stream of oxygen or in oxygen-enriched air. However, it is also formed according to the following reaction equation when potassium is burned in air under atmospheric pressure:
- Potassium reacts with oxygen to form potassium hyperoxide.
See also
Individual evidence
- ↑ a b c d Data sheet potassium hyperoxide (PDF) from Merck , accessed on January 19, 2011.
- ↑ a b Entry for CAS no. 12030-88-5 in the GESTIS substance database of the IFA , accessed on April 6, 2011(JavaScript required) .
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1176.
Web links
- Oxides, peroxides, hyperoxides and ozonides of alkali metals: production, structure, meaning ( Memento of September 27, 2007 in the Internet Archive )