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Properties of substance:

ammonium iron(III) sulfate dodecahydrate


ferric alum;

Physical appearance:

cubic crystals

Empirical formula (Hill's system):

H28FeNO20S2

Structural formula:

NH4Fe(SO4)2 · 12H2O

Molar/atomic mass: 482.19

Melting point (°C):

40

Destruction point (°C):

230

Solubility (g/100 g of solvent):

water: 124 (25°C) [Ref.]
water: 400 (100°C) [Ref.]
ethanol: insoluble [Ref.]

Density:

1.71 (20°C, g/cm3)

Index of refraction:

1.4854 (20°C)

    Neel temperature (K):

    0.043

    References:

    1. Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 22
    2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 96-97
    3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 62
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru