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Properties of substance:

glycolic acid

Group of substances:

organic

Physical appearance:

colorless rhombic crystals

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

C2H4O3

Structural formula as text:

HOCH2COOH

Molar/atomic mass: 76.05

Melting point (°C):

79-80

Solubility (g/100 g of solvent):

diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: 60.96 (24.99°C) [Ref.]

Reactions:

  1. Yeild 80%. [Ref.1]
    HOCH2COOH + CH3OH → HOCH2COOCH3 + H2O

Dissociation:

pKa (1) = 3.83 (25°C, water)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-583 (g)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-504.9 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

318.6 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

87.1 (g)

LD50 (mg/kg):

1950 (rats, oral)
1920 (guinea pig, oral)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-22
  2. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 117-118
  3. Stahl P.H., Wermuth C.G. Handbook of Pharmaceutical Salts: Properties, Selection, and Use. - Wiley-VCH, 2002. - pp. 287
  4. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 34
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 382 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 618-619 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru