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Properties of substance:

phthalic acid

Group of substances:

organic

Physical appearance:

colorless rhombic crystals

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

C8H6O4

Structural formula as text:

C6H4(COOH)2

Molar/atomic mass: 166.1308

Melting point (°C):

200

Decomposition temperature (°C):

200

Solubility (g/100 g of solvent):

1-propanol: 3.54 (-3°C) [Ref.]
1-propanol: 5.56 (19°C) [Ref.]
chloroform: 0.025 (28°C) [Ref.]
diethyl ether: 0.69 (15°C) [Ref.]
ethanol 90%: 10.08 (15°C) [Ref.]
ethanol abs.: 11.7 (15°C) [Ref.]
methanol: 17.8 (-2°C) [Ref.]
methanol: 25.6 (21.4°C) [Ref.]
p-cymene: 0.024 (25°C) [Ref.]
water: 0.54 (14°C) [Ref.]
water: 0.57 (20°C) [Ref.]
water: 7.68 (85°C) [Ref.]
water: 18 (99°C) [Ref.]

Density:

1.593 (20°C, g/cm3)

Dissociation:

pKa (1) = 2.95 (25°C, water)
pKa (2) = 5.41 (25°C, water)

Dipole moment (D):

2.3 (20°C)

LD50 (mg/kg):

1100 (rats, oral)

References:

  1. Journal of Physical and Chemical Reference Data. - 2013. - Vol. 42, No. 3. - pp. 033103-141 - 033103-151
  2. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 572-575
  3. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 456-457
  4. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.2. - Л.: Химия, 1976. - pp. 29 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 190 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 438-439, 492 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1509-1510 [Russian]
  8. Хёрд Ч.Д. Пиролиз соединений углерода. - Л.-М.: ГОНТИ РКТП СССР, 1938. - pp. 398 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru