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Properties of substance:

trifluoroacetic acid

Group of substances:

organic

Physical appearance:

colorless fuming liquid

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

C2HF3O2

Structural formula as text:

CF3COOH

Molar/atomic mass: 114.03

Melting point (°C):

-15.36

Boiling point (°C):

72.4

Solubility (g/100 g of solvent):

acetone: soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
hydrogen fluoride : miscible [Ref.]
water: very soluble [Ref.]

Density:

1.53514 (0°C, g/cm3)
1.489 (20°C, d4)

Reactions of synthesis:

  1. Yeild 84-90%. [Ref.1aster]
    3CF3CCl=CCl2 + 4KMnO4 + 14KOH → 3CF3COOK + 4MnO2 + 9KCl + 3K2CO3 + 7H2O
    CF3COOK + H2SO4 → CF3COOH + KHSO4

Refractive index (nD):

1.285 (20°C)

Dissociation:

H0 (1) = -3.1 (25°C)
pKa (1) = 0.23 (25°C, water)
pKa (1) = 5.4 (25°C, acetic acid)

Permittivity (dielectric constant):

8.55 (20°C)

Viscosity (mPa·s):

0.876 (20°C)
1.225 (0°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1020 (l)

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

34.21

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1031.4 (g)

Critical temperature (°C):

218.15

Critical pressure (MPa):

3.26

Critical density (g/cm3):

0.525

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-21
  2. Альберт А., Сержент Е. Константы ионизации кислот и оснований. - М.-Л.: Химия, 1964. - pp. 118 [Russian]
  3. Гудлицкий М. Химия органических соединений фтора. - М.: ГНТИХЛ, 1961. - pp. 270 [Russian]
  4. Краткая химическая энциклопедия. - Т. 5: Т-Я. - М.: Советская энциклопедия, 1967. - pp. 276 [Russian]
  5. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 563-564 [Russian]
  6. Промышленные фторорганические продукты: Справочник. - Л.: Химия, 1990. - pp. 367-371 [Russian]
  7. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 184 [Russian]
  8. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 118 [Russian]
  9. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 2. - М.: ИИЛ, 1956. - pp. 357 [Russian]
  10. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 9 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru