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Properties of substance:

potassium sulfide

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

K2S

Structural formula as text:

K2S

Molar/atomic mass: 110.26

Melting point (°C):

471

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ammonia liquid : moderately soluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: soluble [Ref.]
ethyl acetate: insoluble [Ref.]
glycerol: 10 (20°C) [Ref.]
methyl acetate: insoluble [Ref.]
water: soluble [Ref.]

Hygroscopic:

yes

Density:

1.8 (20°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    K2S + 3S → K2S4

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

-380.7 (s) [Ref.]
-346.5 (l) [Ref.]

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

-364 (s) [Ref.]

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

105 (s) [Ref.]
141.2 (l) [Ref.]

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

74.7 (l) [Ref.]

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 4-83
  2. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 769
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 69 [Russian]
  4. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 289 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru