Potassium superoxide

Potassium superoxide is an inorganic compound with the formula KO2. It is a yellow paramagnetic solid that decomposes in moist air. It is a rare example of a stable salt of the superoxide anion. It is used as a CO2 scrubber, H2O dehumidifier, and O2 generator in rebreathers, spacecraft, submarines, and spacesuits.

Potassium superoxide

  Potassium cations, K+
  Superoxide anions, O−2
Names
IUPAC name
Potassium superoxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.574
EC Number
  • 234-746-5
RTECS number
  • TT6053000
UN number 2466
  • InChI=1S/2K.O2/c;;1-2/q2*+1;-2 N
    Key: XXQBEVHPUKOQEO-UHFFFAOYSA-N N
  • InChI=1/2K.O2/c;;1-2/q2*+1;-2
    Key: XXQBEVHPUKOQEO-UHFFFAOYAV
  • [K+].[O-]=O
Properties
KO2
Molar mass 71.096 g·mol−1
Appearance yellow solid
Density 2.14 g/cm3, solid
Melting point 560 °C (1,040 °F; 833 K) (decomposes)
Hydrolysis
+3230·10−6 cm3/mol
Structure
Body-centered tetragonal
Thermochemistry
117 J/(mol·K)
−283 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Corrosive, oxidizer, reacts violently with water
GHS labelling:
Danger
H271, H314
P210, P220, P221, P260, P264, P280, P283, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P306+P360, P310, P321, P363, P370+P378, P371+P380+P375, P405, P501
NFPA 704 (fire diamond)
3
0
3
W
OX
Related compounds
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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