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Properties of substance:

3,4,5-trihydroxybenzoic acid



skc-file

Synonyms:

gallic acid

Group of substances:

organic

Physical appearance:

colorless monoclinic crystals

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

C7H6O5

Molar/atomic mass: 170.13

Melting point (°C):

220

Decomposition temperature (°C):

240

Solubility (g/100 g of solvent):

acetone: 35.12 (25°C) [Ref.]
amyl acetate: 2.8 (25°C) [Ref.]
benzene: 0.022 (25°C) [Ref.]
carbon disulphide: 0.042 (25°C) [Ref.]
chloroform: insoluble [Ref.]
diethyl ether: 3.5 (15°C) [Ref.]
ethanol 30%: 8.11 (25°C) [Ref.]
ethanol 80%: 24.8 (25°C) [Ref.]
ethanol 90%: 26.9 (25°C) [Ref.]
ethanol 95%: 27.6 (25°C) [Ref.]
ethanol abs.: 28.5 (25°C) [Ref.]
ethyl acetate: 3.75 (25°C) [Ref.]
formic acid 95%: 0.56 (19.4°C) [Ref.]
glycerol: 8.3 (25°C) [Ref.]
i-amyl alcohol: 5.7 (25°C) [Ref.]
water: 0.95 (15°C) [Ref.]
water: 1.65 (25°C) [Ref.]
water: 33 (100°C) [Ref.]

Density:

1.694 (4°C, g/cm3)

Dissociation:

pKa (1) = 4.41 (25°C, water)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-530
  2. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 533
  3. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1112, 1302 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 578-579 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru