na +o2

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Sodium superoxide
Oxidised sodium after improper storage under contaminated hexane showing an orange crust of sodium superoxide.
Names
IUPAC name

sodium superoxide

Other names

sodium superoxide
sodium dioxide

Identifiers

CAS Number
  • 1313-60-6 check

3D model (JSmol)
  • Interactive image
ChemSpider
  • 8305406

PubChem CID
  • 61542
RTECS number
  • WE2860010
UNII
  • 3GSN3JCJ5K check
UN number 2547

CompTox Dashboard (EPA)
  • DTXSID30894055 Edit this at Wikidata

InChI

  • InChI=1S/Na.HO2/c;1-2/h;1H/q+1;/p-1

    Key: TZACNHSIZFFYEH-UHFFFAOYSA-M

SMILES

  • [O-][O].[Na+]

Properties

Chemical formula

 NaO2
Molar mass 54.9886 g/mol
Appearance Yellow to tướng orange crystalline solid
Density 2.2 g/cm3
Melting point 551.7 °C (1,025.1 °F; 824.9 K)
Boiling point Decomposes

Solubility in water

 Decomposes
Basicity (pKb) N/A
Structure

Crystal structure

 cubic
Thermochemistry

Heat capacity (C)

 72.1 J/mol K

Std molar
entropy (S⦵298)

 115.9 J/mol K

Std enthalpy of
formation (ΔfH⦵298)

 -260.2 kJ/mol

Gibbs không tính tiền energy (ΔfG⦵)

Xem thêm: k2o + hcl

 -218.4 kJ/mol
Hazards
GHS labelling:

Pictograms

 GHS03: OxidizingGHS05: Corrosive

Signal word

 Danger

Hazard statements

 H271, H314

Precautionary statements

 P210, P220, P260, P280, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazard OX: Oxidizer. E.g. potassium perchlorate

3

1

OX

Flash point Non flammable
Related compounds

Other anions

 sodium oxide
sodium peroxide

Other cations

 Lithium superoxide
Potassium superoxide
Rubidium superoxide
Caesium superoxide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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Infobox references

Sodium superoxide is the inorganic compound with the formula NaO2.[1] This yellow-orange solid is a salt of the superoxide anion. It is an intermediate in the oxidation of sodium by oxygen.

Preparation[edit]

NaO2 is prepared by treating sodium peroxide with oxygen at high pressures:[2]

Na2O2 + O2 → 2 NaO2

It can also be prepared by careful oxygenation of a solution of sodium in ammonia:

Na(in NH3) + O2 → NaO2

It is also produced, along with sodium peroxide, when sodium is stored under inappropriate conditions (e.g. in dirty or partially halogenated solvents)[citation needed].

Properties[edit]

The product is paramagnetic, as expected for a salt of the O−
2 anion. It hydrolyses readily to tướng give a mixture of sodium hydroxide, oxygen and hydrogen peroxide.[3] It crystallizes in the NaCl motif.

Xem thêm: ch3 ch2 ch3

References[edit]

  1. ^ Hayyan, Maan; Hashim, Mohd Ali; AlNashef, Inas M. (2016-02-15). "Superoxide Ion: Generation and Chemical Implications". Chemical Reviews. American Chemical Society (ACS). 116 (5): 3029–3085. doi:10.1021/acs.chemrev.5b00407. ISSN 0009-2665. PMID 26875845.
  2. ^ Stephen E. Stephanou, Edgar J. Seyb Jr., Jacob Kleinberg "Sodium Superoxide" Inorganic Syntheses 1953; Vol. 4, 82-85.
  3. ^ Sasol Encyclopaedia of Science and Technology , G.C. Gerrans, Phường. Hartmann-Petersen , p.243 "sodium oxides" , google books link