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Properties of substance:

iron(II) sulfate heptahydrate


Physical appearance:

bluish green monoclinic crystals

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


Structural formula:

FeSO4 · 7H2O

Molar/atomic mass: 278.01

Melting point (°C):


Destruction point (°C):


Solubility (g/100 g of solvent):

water: 15.8 (0°C) [Ref.]
water: 20.8 (10°C) [Ref.]
water: 26.3 (20°C) [Ref.]
water: 32.8 (30°C) [Ref.]
water: 40.1 (40°C) [Ref.]
water: 48.4 (50°C) [Ref.]
water: 55.3 (63.7°C) [Ref.]
water: 43.7 (80°C) [Ref.]


1.898 (18°C, g/cm3)

Index of refraction:

1.478 (20°C)

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

    -3016 (s)

    Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

    -2512 (s)

    Standard molar entropy S0 (298.15 K, J/mol·K):

    409.1 (s)

    Molar heat capacity at constant pressure Cp (298.15 K, J/mol·K):

    394.5 (s)

    LD50 (mg/kg):

    533 (rats, oral)


    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 539-541
    2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 63
    3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 351
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      © Collected Ruslan Anatolievich Kiper,