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Properties of substance:

dl-malic acid

Group of substances:

organic

Physical appearance:

white powder

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

C4H6O5

Structural formula as text:

HOOCCH2CH(OH)COOH

Molar/atomic mass: 134.1

Melting point (°C):

131.5

Boiling point (°C):

150

CAS №: 6915-15-7

Solubility (g/100 g of solvent):

ethanol: very soluble [Ref.]
sulfuric acid: reaction [Ref.]
water: 47.09 (0°C) [Ref.]
water: 51.22 (10°C) [Ref.]
water: 55.75 (20°C) [Ref.]
water: 59.18 (25°C) [Ref.]
water: 64.29 (40°C) [Ref.]
water: 82.14 (80°C) [Ref.]

Dissociation:

pKa (1) = 3.4 (25°C, water)
pKa (2) = 5.11 (25°C, water)

References:

  1. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 232-233
  2. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 99-100
  3. Полюдек-Фабини Р., Бейрих Т. Органический анализ. - Л.: Химия, 1981. - pp. 157 [Russian]
  4. Свойства органических соединений: Справочник. - Под ред. Потехина А.А. - Л.: Химия, 1984. - pp. 136-137 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru