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Properties of substance:

terephthalic acid

Group of substances:

organic

Physical appearance:

colorless needles 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):

425

Solubility (g/100 g of solvent):

acetic acid: 0.035 (25°C) [Ref.]
acetic acid: 0.1 (108°C) [Ref.]
acetone: insoluble [Ref.]
chloroform: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
dimethylformamide: 6.7 (25°C) [Ref.]
dimethylsulfoxide: 20 (25°C) [Ref.]
ethanol: 0.112 (20°C) [Ref.]
ethanol: 0.158 (40°C) [Ref.]
ethanol: sparingly soluble 0.26 (60°C) [Ref.]
formic acid 95%: 0.55 (20.2°C) [Ref.]
methanol: 0.1 (25°C) [Ref.]
pyridine: soluble [Ref.]
sulfuric acid: 2 (25°C) [Ref.]
sulfuric acid: soluble (300°C) [Ref.]
water: 0.0006 (20°C) [Ref.]
water: 0.00146 (40°C) [Ref.]
water: 0.00388 (60°C) [Ref.]
water: 0.0084 (80°C) [Ref.]

Density:

1.51 (20°C, g/cm3)

Dissociation:

pKa (1) = 3.54 (25°C, water)
pKa (2) = 4.46 (25°C, water)

Heat of combustion (kJ/mol):

3223.3

LD50 (mg/kg):

10000 (rats, oral)
19000 (mice, oral)
1430 (mice, intraperitoneal)

References:

  1. Gangolli S. The Dictionary of Substances and their Effects. - 2 ed., Vol. 7, T-Z. - RSC, 1999. - pp. 46-48
  2. Journal of Physical and Chemical Reference Data. - 2013. - Vol. 42, No. 3. - pp. 033103-163 - 033103-176
  3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 572-574
  4. Мономеры для поликонденсации. - М.: Мир, 1976. - pp. 377-386 [Russian]
  5. Овчинников В.И., Назимок В.Ф., Симонова Т.А. Производство терефталевой кислоты и ее диметилового эфира. - М.: Химия, 1982. - pp. 224 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 180, 223 [Russian]
  7. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 532 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru