Potassium hyperoxide

Structural formula
General
Surname	Potassium hyperoxide
other names	Potassium peroxide
Molecular formula	KO 2
Brief description	yellow solid
External identifiers / databases
CAS number 12030-88-5 EC number 234-746-5 ECHA InfoCard 100,031,574 PubChem 61541 ChemSpider 28638468 Wikidata Q411162
properties
Molar mass	71,10 g · mol -1
Physical state	firmly
density	2.14 g cm −3
Melting point	380 ° C
solubility	Violent decomposition in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 271-314 P: 220-280-305 + 351 + 338-310
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 .

${\displaystyle \mathrm {4\ KO_{2}+2\ H_{2}O\longrightarrow 4\ KOH+3\ O_{2}} }$

Potassium hyperoxide reacts with water to form potassium hydroxide and oxygen.

${\displaystyle \mathrm {2\ KO_{2}+4\ H_{2}O\longrightarrow 2\ KOH+3\ H_{2}O_{2}} }$

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.

${\displaystyle \mathrm {4\ KO_{2}+4\ CO_{2}+2\ H_{2}O\longrightarrow 4\ KHCO_{3}+3\ O_{2}} }$

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:

${\displaystyle \mathrm {K+O_{2}\longrightarrow KO_{2}} }$

Potassium reacts with oxygen to form potassium hyperoxide.

See also

• Potassium oxide
• Potassium peroxide

Individual evidence

1. ↑ ^{a b c d} Data sheet potassium hyperoxide (PDF) from Merck , accessed on January 19, 2011.
2. ↑ ^{a b} Entry for CAS no. 12030-88-5 in the GESTIS substance database of the IFA , accessed on April 6, 2011(JavaScript required) .
3. ^ 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 )