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Properties of substance:

octanoic acid

Synonyms:

caprylic acid

Group of substances:

organic

Physical appearance:

colorless oily liquid

Empirical formula (Hill's system for organic substances):

C8H16O2

Structural formula as text:

CH3(CH2)6COOH

Molar/atomic mass: 144.2114

Melting point (°C):

16

Boiling point (°C):

237.5

Solubility (g/100 g of solvent):

1-butanol: 280 (20°C) [Ref.]
2-propanol: 360 (20°C) [Ref.]
acetic acid: soluble [Ref.]
acetone: soluble [Ref.]
benzene: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: miscible [Ref.]
ethanol: miscible [Ref.]
hexane: 14.7 (-20°C) [Ref.]
hexane: 42.5 (-10°C) [Ref.]
hexane: 136 (0°C) [Ref.]
hexane: 2600 (10°C) [Ref.]
hexane: miscible (20°C) [Ref.]
methanol: 510 (20°C) [Ref.]
water: 0.044 (0°C) [Ref.]
water: 0.068 (20°C) [Ref.]
water: 0.079 (30°C) [Ref.]
water: 0.095 (45°C) [Ref.]
water: 0.113 (60°C) [Ref.]
water: 0.25 (100°C) [Ref.]

Not numerical data:

volatile in steam

Density:

0.9088 (20°C, d4)

Refractive index (nD):

1.428 (20°C)

Dissociation:

pKa (1) = 4.89 (25°C, water)

LD50 (mg/kg):

10080 (rats, oral)
600 (mice, intravenous)

References:

  1. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 619-620
  2. Stahl P.H., Wermuth C.G. Handbook of Pharmaceutical Salts: Properties, Selection, and Use. - Wiley-VCH, 2002. - pp. 276-277
  3. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 528
  4. Досон Р., Эллиот Д., Эллиот У., Джонс К. Справочник биохимика. - М.: Мир, 1991. - pp. 145 [Russian]
  5. Маркман А.Л. Химия липидов. - Вып. 1: Жирные кислоты. - Ташкент: Издательство АН Узбекской ССР, 1963. - pp. 16 [Russian]
  6. Свойства органических соединений: Справочник. - Под ред. Потехина А.А. - Л.: Химия, 1984. - pp. 260-261 [Russian]
  7. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 708-709 [Russian]
  8. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 89 [Russian]
  9. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 241 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru