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Properties of substance:

aluminum potassium sulfate

Synonyms:

potassium aluminium sulfate
burnt potassium alum

Group of substances:

inorganic

Physical appearance:

white trigonal crystals

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

AlKO8S2

Structural formula as text:

KAl(SO4)2

Molar/atomic mass: 258.2

Decomposition temperature (°C):

800-900

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 3 (0°C) [Ref.]
water: 5 (15°C) [Ref.]
water: 7.09 (25°C) [Ref.]
water: 8.4 (30°C) [Ref.]
water: 24.8 (60°C) [Ref.]
water: 67 (85°C) [Ref.]
water: 154 (100°C) [Ref.]

Properties of solutions:

6,62% (wt.), solvent - water
  Density (g/cm3) = 1.061 (25°)

Hygroscopic:

very hygroscopic

Density:

2.75 (20°C, g/cm3)

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

-2470.2 (s) [Ref.]

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

204.6 (s) [Ref.]

Enthalpy (heat) of solution ΔsolH (kJ)

-203.1 (s) [solvent: water, 18°C, 1 mol in 600 mol of water] [Ref.]

References:

  1. Milne G.W.A. Gardner's Commercially Important Chemicals. - Wiley-Interscience, 2005. - pp. 23
  2. Лидин Р.А., Молочко В.А., Андреева Л.Л. Химические свойства неорганических веществ. - М.: Химия, 2000. - pp. 85 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 46-47 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 176 [Russian]
  5. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 18-19 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru