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Properties of substance:

oxalic acid

Group of substances:

organic

Physical appearance:

colorless monoclinic crystals

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

C2H2O4

Structural formula as text:

(COOH)2

Molar/atomic mass: 90.04

Melting point (°C):

189.5

CAS №: 144-62-7

Solubility (g/100 g of solvent):

1-propanol: 13.9 (-1.2°C) [Ref.]
1-propanol: 20 (18.5°C) [Ref.]
ammonia liquid : insoluble [Ref.]
benzene: insoluble [Ref.]
chloroform: insoluble [Ref.]
diethyl ether: 16.9 (20°C) [Ref.]
diethyl ether: 23.59 (25°C) [Ref.]
dimethylsulfoxide: 26 (20.3°C) [Ref.]
ethanol 90%: 14.7 (15°C) [Ref.]
ethanol abs.: 23.73 (15°C) [Ref.]
ethyl acetate: soluble [Ref.]
formic acid 95%: 9.74 (16.8°C) [Ref.]
glycerol: 14.9 (15.5°C) [Ref.]
hydrogen fluoride : very soluble [Ref.]
i-butanol: 12.2 (20.2°C) [Ref.]
methanol: 25 (-35°C) [Ref.]
methanol: 100 (19°C) [Ref.]
nickel tetracarbonyl: insoluble [Ref.]
petroleum ether: insoluble [Ref.]
sulfuric acid: reaction [Ref.]
water: 10 (20°C) [Ref.]
water: 25 (44.5°C) [Ref.]
water: 100 (86.5°C) [Ref.]
water: 120 (100°C) [Ref.]

Properties of solutions:

4% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.086 (20°)
  Density (g/cm3) = 1.0174 (20°)
  Index of refraction = 1.3375 (20°)
  Freezing point (°C) = -1.09

Reactions:

  1. [Ref.1aster, Ref.2aster]
    2KClO3 + H2C2O4 + H2SO4 → 2ClO2 + 2CO2 + K2SO4 + 2H2O

Vapour pressure (Torr):

0.01 (60°C)
0.53 (105°C)

Dissociation:

pKa (1) = 1.27 (25°C, water)
pKa (2) = 4.27 (25°C, water)

Dipole moment (D):

2.63 (20°C)

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

-826.8 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-697.9 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

120.1 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

108.8 (s)

Heat of combustion (kJ/mol):

252

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

-731.8 (g)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-662.7 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

320.6 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

86.2 (g)

LD50 (mg/kg):

7500 (rats, oral)
270 (mice, intraperitoneal)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-430
  2. Journal of Chemical Thermodynamics. - 1987. - Vol. 19. - pp. 317-320
  3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 79-84
  4. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 23-24
  5. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 202 [Russian]
  6. Мономеры для поликонденсации. - М.: Мир, 1976. - pp. 17-25 [Russian]
  7. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 564 [Russian]
  8. Неотложная помощь при острых отравлениях: Справочник по токсикологии. - Под ред. Голикова С.Н. - М.: Медицина, 1977. - pp. 136-137 [Russian]
  9. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 196, 224 [Russian]
  10. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 377-378 [Russian]
  11. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1133, 1173 [Russian]
  12. Фрейдлин Г.Н. Алифатические дикарбоновые кислоты. - М., 1978. - pp. 10-45 [Russian]
  13. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 402 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru