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O₃

Ozone

IUPAC : Ozone
OtherIndustrialEveryday

Triatomic allotrope of oxygen. In the stratosphere the ozone layer filters UV-C and part of UV-B; at ground level it is a pollutant and a strong oxidiser used for water disinfection.

3D ball-and-stick representation of Ozone (formula O₃). Constituent atoms: O.
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Physical properties

Molar mass47.998 g/mol
State at 20 °Cgas
Density—
Melting point80.70 K (-192.45 °C)
Boiling point161.30 K (-111.85 °C)
Solubility (H₂O)1.05 g/L à 0 °C

Structure

Crystal system—
3D render modeBall-and-stick

Uses and applications

  • Stratospheric ozone layer (protection from solar UV)
  • Drinking-water disinfection (alternative to chlorine)
  • Hospital and food-industry sterilisation
  • Pulp bleaching
  • Chemical synthesis (alkene ozonolysis)

Safety (GHS)

GHS03 · OxidisingGHS06 · Acute toxicityGHS07 · Harmful / irritant
H statements : H270, H330, H372

Very powerful oxidiser and toxic by inhalation even at low concentration. Characteristic "storm-air" smell.

Constituent elements

8O
Oxygen

References

PubChem CID24823
CAS10028-15-6
SMILES[O-][O+]=O
Sources : PubChem CID 24823 · NIST Chemistry WebBook