Butyric acid

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Chemical structure

Butyric acid.jpg

A colorless liquid with a rancid butter smell. Butyric acid occurs naturally in butter in concentration of about 5%. It is used in the manufacture of varnishes and the pretreatment of hides for tanning.

Synonyms and Related Terms

butanoic acid; n-butyric acid; ethylacetic acid; propylformic acid


  • Combustible. Flash point = 69C.
  • Strongly irritating to skin and tissue. May cause burns.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Miscible with water, ethanol, ether.

Composition CH3CH2CH2COOH
CAS 107-92-6
Melting Point -7.9 C
Density 0.959 g/ml
Molecular Weight mol. wt. = 88.11
Refractive Index 1.3981
Boiling Point 163.5C

Resources and Citations

  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 343
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1566; ref. index=1.3981
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.396