Hydrogen chloride

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A colorless, fuming gas with a suffocating odor. Hydrogen chloride is the byproduct in the production of organic chlorides. It is used in organic synthesis and for the chlorination of rubber.

Synonyms and Related Terms

muriatic acid gas; anhydrous hydrochloric acid


  • Nonflammable.
  • Avoid all contact.
  • Corrosive to skin and eyes.
  • Toxic by inhalation.
  • Airgas: SDS

Physical and Chemical Properties

Soluble in water, ethanol and ether.

Composition HCl
CAS 7647-01-0
Melting Point -114 C
Density 1.00 g/ml
Molecular Weight mol. wt. = 36.5
Boiling Point -85 C

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 464
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4835
  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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