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Properties of substance:

ammonium iron(III) sulfate dodecahydrate

Synonyms:

ferric alum

Group of substances:

inorganic

Physical appearance:

cubic crystals

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

H28FeNO20S2

Structural formula as text:

NH4Fe(SO4)2 * 12H2O

Molar/atomic mass: 482.19

Melting point (°C):

40

Decomposition temperature (°C):

230

Solubility (g/100 g of solvent):

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

Density:

1.71 (20°C, g/cm3)

Refractive index (nD):

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 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 62 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru