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Properties of substance:

2,2-dimethylpropanoic acid

Synonyms:

pivalic acid
trimethylacetic acid

Group of substances:

organic

Physical appearance:

colorless needles crystals

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

C5H10O2

Structural formula as text:

(CH3)3CCOOH

Molar/atomic mass: 102.132

Melting point (°C):

35.5

Boiling point (°C):

163.8

Solubility (g/100 g of solvent):

diethyl ether: very soluble [Ref.]
ethanol: very soluble [Ref.]
water: 2.17 (20°C) [Ref.]

Dissociation:

pKa (1) = 5.05 (25°C, water)
pKa (1) = 7.39 (20°C, formamide)

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

-564.5 (s)

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

-491.3 (g)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-29
  2. Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 505
  3. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 168
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 876-877 [Russian]
  5. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 94 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru