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Properties of substance:

L-cysteine

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

Destruction point (°C):

240

Solubility (g/100 g of solvent):

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
    4. Справочник химика. - Т.2. - Л.-М.: Химия, 1964. - pp. 1110-1111
    5. Справочник химика. - Т.3. - М.-Л.: Химия, 1965. - pp. 97
    6. Химическая энциклопедия. - Т.5. - М.: Советская энциклопедия, 1999. - pp. 388
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru