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Properties of substance:

squaric acid



skc-file

Group of substances:

organic

Physical appearance:

colorless crystals

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

C4H2O4

Molar/atomic mass: 114.06

Melting point (°C):

293-294

CAS №: 2892-51-5

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
water: 2 (room temperature) [Ref.]
water: 7.5 (100°C) [Ref.]

Dissociation:

pKa (1) = 1.5 (20°C, water)
pKa (2) = 2.93 (20°C, water)

Spectral properties of the substance:

Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 269,5 (37)

References:

  1. Armarego W. L. F. Purification of Laboratory Chemicals. - 5ed. - 2003. - pp. 352
  2. The Merck Index. - 15th ed. - Royal Society of Chemistry, 2013. - pp. 1624
  3. Физер Л., Физер М. Реагенты для органического синтеза. - Т. 7. - М.: Мир, 1978. - pp. 177 [Russian]
  4. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 366 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru