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Properties of substance:

octadecanoic acid

Synonyms:

stearic acid

Group of substances:

organic

Physical appearance:

colorless monoclinic crystals

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

C18H36O2

Structural formula as text:

CH3(CH2)16COOH

Molar/atomic mass: 284.4772

Melting point (°C):

69.4-72

Boiling point (°C):

370

Decomposition temperature (°C):

370

Solubility (g/100 g of solvent):

1,1,2-trichloro-1,2,2-trifluoroethane: soluble [Ref.]
1-butanol: 1.6 (20°C) [Ref.]
2-propanol: 2 (20°C) [Ref.]
acetic acid: 0.12 (20°C) [Ref.]
acetone: 4.96 (25°C) [Ref.]
amyl acetate: 12.6 (25°C) [Ref.]
benzene: 2.46 (20°C) [Ref.]
carbon disulphide: 23.8 (25°C) [Ref.]
carbon tetrachloride: 11.42 (25°C) [Ref.]
chloroform: 18.4 (25°C) [Ref.]
cyclohexane: 2.4 (20°C) [Ref.]
diethyl ether: 25.06 (25°C) [Ref.]
dimethylsulfoxide: 1.8 (25°C) [Ref.]
ethanol: 3.16 (20°C) [Ref.]
ethanol: 24.9 (40°C) [Ref.]
ethanol 95%: 1.13 (20°C) [Ref.]
ethyl acetate: 7.94 (25°C) [Ref.]
hexane: 0.5 (20°C) [Ref.]
hexane: 4.3 (30°C) [Ref.]
hexane: 19 (40°C) [Ref.]
hexane: 79.2 (50°C) [Ref.]
hexane: 303 (60°C) [Ref.]
hydrogen fluoride : very soluble [Ref.]
i-amyl alcohol: 10.41 (25°C) [Ref.]
iron pentacarbonyl: very slightly soluble [Ref.]
methanol: 0.1 (20°C) [Ref.]
methyl formate: 1.3 (25°C) [Ref.]
methylene chloride: 3.58 (25°C) [Ref.]
methylene chloride: 8.85 (30°C) [Ref.]
methylene chloride: 18.3 (35°C) [Ref.]
nitrobenzene: 1.26 (25°C) [Ref.]
toluene: 15.75 (25°C) [Ref.]
water: 0.00018 (0°C) [Ref.]
water: 0.00029 (20°C) [Ref.]
water: 0.00034 (30°C) [Ref.]
water: 0.00042 (45°C) [Ref.]
water: 0.0005 (60°C) [Ref.]

Density:

0.9408 (20°C, d4)
0.839 (80°C, d4)

Vapour pressure (Torr):

0.25 (159°C)
15 (232°C)
17 (238°C)
100 (291°C)

LD50 (mg/kg):

21.5 (rats, intravenous)
23 (mice, intravenous)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-462
  2. Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 637
  3. Jouyban A. Handbook of solubility data for pharmaceutacals. – CRC Press, 2010. - pp. 71
  4. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 787-789
  5. Stahl P.H., Wermuth C.G. Handbook of Pharmaceutical Salts: Properties, Selection, and Use. - Wiley-VCH, 2002. - pp. 305
  6. Маркман А.Л. Химия липидов. - Вып. 1: Жирные кислоты. - Ташкент: Издательство АН Узбекской ССР, 1963. - pp. 16 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1194, 1583 [Russian]
  8. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 952-953 [Russian]
  9. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 541 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru