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Properties of substance:

angelic acid

Group of substances:

organic

Physical appearance:

monoclinic crystals

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

C5H8O2

Structural formula as text:

CH3CH=C(CH3)COOH

Melting point (°C):

45

Boiling point (°C):

185

CAS №: 565-63-9

Solubility (g/100 g of solvent):

diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: very soluble (hot) [Ref.]
water: sparingly soluble (cold) [Ref.]

Not numerical data:

volatile in steam

Density:

0.983 (47°C, d4)

Vapour pressure (Torr):

12 (86°C)

Dissociation:

pKa (1) = 4.3 (25°C, water)

References:

  1. The Merck Index. - 15th ed. - Royal Society of Chemistry, 2013. - pp. 110-111
  2. Справочник химика. - 2 изд., Т. 2. - Л.-М.: Химия, 1964. - pp. 420-421 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru