Sulfur trioxide

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Description

An unstable solid that can sublime at room temperature. Sulfur trioxide is one of the sulfur oxide pollutants formed when Sulfur compounds are burned. It reacts readily and exothermically with water to form Sulfuric acid. Sulfur trioxide is a strong oxidizing agent. It is primarily used industrially in nonionic detergents, explosives, and solar energy collectors.

Chemical structure

Sulfur trioxide.jpg


Synonyms and Related Terms

sulfuric anhydride; sulphur trioxide (Br.)

Risks

  • Fire hazard in contact with flammable organic compounds.
  • Highly toxic.
  • Hygroscopic.
  • Corrosive.
  • Contact causes irritation and burns.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Composition SO3
CAS 7446-11-9
Melting Point 16.8 C
Density 1.9224 g/ml
Molecular Weight mol. wt. = 80.06
Boiling Point 44.8 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 9152
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982