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Properties of substance:

l-cystine

Group of substances:

organic

Physical appearance:

hexagonal crystals

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

C6H12N2O4S2

Structural formula as text:

HOOCCH(NH2)CH2SSCH2CH(NH2)COOH

Molar/atomic mass: 240.29

Melting point (°C):

258-261

Solubility (g/100 g of solvent):

water: 0.011 (25°C) [Ref.]
water: 0.05197 (75°C) [Ref.]

Dissociation:

pKa (1) = 7.85 (25°C, water)
pKa (2) = 9.85 (25°C, water)

References:

  1. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 442-445
  2. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 298
  3. Досон Р., Эллиот Д., Эллиот У., Джонс К. Справочник биохимика. - М.: Мир, 1991. - pp. 36 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 458 [Russian]
  5. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 1110-1111 [Russian]
  6. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 97 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru