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Properties of substance:

aluminum ammonium sulfate dodecahydrate

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

H28AlNO20S2

Structural formula as text:

NH4Al(SO4)2 * 12H2O

Molar/atomic mass: 453.32

Melting point (°C):

95

Decomposition temperature (°C):

120

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 2.1 (0°C) [Ref.]
water: 4.99 (10°C) [Ref.]
water: 7.74 (20°C) [Ref.]
water: 9.19 (25°C) [Ref.]
water: 10.94 (30°C) [Ref.]
water: 14.88 (40°C) [Ref.]
water: 20.1 (50°C) [Ref.]
water: 26.7 (60°C) [Ref.]
water: 109.7 (95°C) [Ref.]

Density:

1.64 (20°C, g/cm3)

Refractive index (nD):

1.459 (20°C)

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

-5943 (s) [Ref.]

Standard molar Gibbs energy of formation ΔfG (298 K, kJ/mol)

-4935 (s) [Ref.]

Standard molar entropy S (298 K, J/(mol·K))

706.5 (s) [Ref.]

Molar heat capacity at constant pressure Cp (298 K, J/(mol·K))

681 (s) [Ref.]

References:

  1. Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 3, 17-18
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 52 [Russian]
  3. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 18-19 [Russian]
  4. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 30 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru