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Properties of substance:

3,4-dihydroxybenzoic acid

Synonyms:

protocatechuic acid

Group of substances:

organic

Physical appearance:

monoclinic crystals

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

C7H7O4

Structural formula as text:

(HO)2C6H3COOH

Molar/atomic mass: 154.13

Melting point (°C):

199

Decomposition temperature (°C):

199

Solubility (g/100 g of solvent):

benzene: insoluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: 1.82 (14°C) [Ref.]
water: 22.2 (80°C) [Ref.]

Dissociation:

pKa (1) = 4.48 (25°C, water)

References:

  1. Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 539
  2. Journal of Physical and Chemical Reference Data. - 2013. - Vol. 42, No. 3. - pp. 033103-264 - 033103-265
  3. The Merck Index 11th ed., Merck & Company, 1989. - pp. 1254
  4. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 378
  5. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 926-927 [Russian]
  6. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 88 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru