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Properties of substance:

1,2,4,5-benzenetetracarboxylic acid

Synonyms:

pyromellitic acid

Group of substances:

organic

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

C10H6O8

Structural formula as text:

C6H2(COOH)4

Molar/atomic mass: 254.16

Melting point (°C):

272

Solubility (g/100 g of solvent):

diethyl ether: difficulty soluble [Ref.]
ethanol: very soluble [Ref.]
water: 1.42 (16°C) [Ref.]

    Dissociation:

    pKa (1) = 1.92 (25°C, water)
    pKa (2) = 2.87 (25°C, water)
    pKa (3) = 4.49 (25°C, water)
    pKa (4) = 5.63 (25°C, water)

    References:

    1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-36, 8-89
    2. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 892-893 [Russian]
    3. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 269 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru