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Hexanoic acid
Caproic acid acsv.svg
IUPAC name
Other names C6:0 (Lipid numbers)
CAS number 142-62-1 Yes check.svgY
PubChem 8892
Molecular formula C6H12O2
Molar mass 116.15828
Density 0.920 g/cm3
Melting point

−3.4 °C

Boiling point

202-203 °C

Solubility in methanol methanol 7.98 M [1]
Acidity (pKa) 4.88
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Hexanoic acid (common name caproic acid), is the carboxylic acid derived from hexane with the general formula C5H11COOH. It is a colorless oily liquid with an odor reminiscent of goats or other barnyard animals. It is a fatty acid found naturally in various animal fats and oils, and is one of the chemicals that gives the decomposing fleshy seed coat of the ginkgo its characteristic unpleasant odor.[2]

The salts and esters of this acid are known as hexanoates or caproates.

Three such acids are named after goats: caproic (C6), caprylic (C8), capric (C10), totaling 15% in goat milk fat.


  1. ^ Solubility of hexanoic acid in methanol
  2. ^ Ginkgo.html

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