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Properties of substance:

potassium aluminium sulfate dodecahydrate

Synonyms:

aluminium potassium sulfate dodecahydrate

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

H24AlKO16S

Structural formula as text:

KAl(SO4)2 * 12H2O

Molar/atomic mass: 474.38

Melting point (°C):

92.5

Decomposition temperature (°C):

120

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ethanol: insoluble [Ref.]
methyl acetate: insoluble [Ref.]
water: 5.22 (0°C) [Ref.]
water: 9.16 (10°C) [Ref.]
water: 13.66 (20°C) [Ref.]
water: 19.29 (30°C) [Ref.]
water: 27.3 (40°C) [Ref.]
water: 36.5 (50°C) [Ref.]
water: 51.3 (60°C) [Ref.]
water: 71.97 (70°C) [Ref.]
water: 103.1 (80°C) [Ref.]
water: 187.8 (90°C) [Ref.]
water: 421.9 (100°C) [Ref.]

Density:

1.75 (20°C, g/cm3)

Dissociation:

pKa (1) = 5.02 (25°C, water)

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

-6063 (s) [Ref.]

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

-5142 (s) [Ref.]

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

687 (s) [Ref.]

Enthalpy (heat) of solution ΔsolH (kJ)

42.31 (s) [solvent: water, 18°C, 1 mol in 1200 mol of water] [Ref.]

References:

  1. Девяткин В.В., Ляхова Ю.М. Химия для любознательных, или о чем не узнаешь на уроке. - Ярославль: Академия Холдинг, 2000. - pp. 78 [Russian]
  2. Лидин Р.А., Молочко В.А., Андреева Л.Л. Химические свойства неорганических веществ. - М.: Химия, 2000. - pp. 85 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 52 [Russian]
  4. Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 202 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru