Main page (Russian) Search in database (English)

Properties of substance:

L-cysteine

Group of substances:

organic

Physical appearance:

colorless crystals

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

C3H7NO2S

Structural formula as text:

HSCH2CH(NH2)COOH

Molar/atomic mass: 121.16

Melting point (°C):

240

Decomposition temperature (°C):

240

Solubility (g/100 g of solvent):

acetic acid: soluble [Ref.]
acetone: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: very soluble [Ref.]
water: 0.336 (20°C) [Ref.]

Dissociation:

pI (1) = 5.07 (25°C, water)
pKBH+ (1) = 8.14 (30°C, water)
pKa (1) = 1.71 (25°C, water)
pKa (2) = 10.34 (30°C, water)

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

-534.1 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-24
  2. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 72
  3. Досон Р., Эллиот Д., Эллиот У., Джонс К. Справочник биохимика. - М.: Мир, 1991. - pp. 36 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 1110-1111 [Russian]
  5. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 97 [Russian]
  6. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 388 [Russian]

    What information do you need?




    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru