Barium peroxide

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Barium peroxide
IUPAC name barium peroxide
Other names Barium binoxide, Barium dioxide, Barium superoxide, UN 1449
Identifiers
CAS number [1304-29-6]
PubChem 14773
EINECS number 215-128-4
RTECS number CR0175000
Properties
Molecular formula BaO2
Molar mass 169.33 g/mol
Appearance Grey-white crystalline solid
Density 4.95 g/cm³, solid
Melting point

450 °C (723 K)
Boiling point

800 °C (1073 K) (decomp. to BaO + O2)
Solubility in water Slightly soluble
Hazards
Main hazards Harmful (Xn)
NFPA 704
0
1
0
OX
R-phrases R8 R20/22
S-phrases (S2) S13 S27
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Barium peroxide is the chemical compound with the formula BaO2. This grey-white solid is one of the most common inorganic peroxides. Barium peroxide is an oxidizing agent, which is used for bleaching. It is used in fireworks as an oxidizer,[1] which also gives a vivid green colour, as do all barium compounds.

Barium peroxide is a peroxide, containing O22− subunits wherein the oxygen atoms bond to each other as well as to the barium. The solid adopts the same structure as calcium carbide, CaC2.

Barium peroxide arises by the reversible absorption of O2 by barium oxide. The oxygen is released above 700°C.

BaO + 1/2 O2 ⇌ BaO2

This reaction is the basis for the now-obsolete Brin Process for separating oxygen from the atmosphere. Other oxides, e.g. Na2O, behave similarly.[2]

Hydrogen peroxide can also be prepared via the related reaction:

BaO2 + H2SO4 → H2O2 + BaSO4

[edit] Footnotes

  1. ^ Data Sheet. Data Sheet. Hummel Croton Inc. Retrieved on 2007-02-01.
  2. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.

[edit] See also

[edit] External links

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