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Properties of substance:

sodium sulfide

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

Na2S

Structural formula as text:

Na2S

Molar/atomic mass: 78.04

Melting point (°C):

1180

Solubility (g/100 g of solvent):

ammonia liquid : 0.0242 (-33.6°C) [Ref.]
ammonia liquid : 0.0223 (-32.9°C) [Ref.]
benzylic alcohol: soluble with solvolysis [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: 11.4 (20°C) [Ref.]
ethylene glycol : soluble [Ref.]
i-butanol: soluble with reaction 3.9 (20°C) [Ref.]
methanol: soluble with reaction 20.3 (20°C) [Ref.]
water: 12.4 (0°C) [Ref.]
water: 18.6 (20°C) [Ref.]
water: 29 (40°C) [Ref.]
water: 39.1 (60°C) [Ref.]
water: 49.2 (80°C) [Ref.]

Hygroscopic:

yes

Density:

1.86 (20°C, g/cm3)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-370.3 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-354.8 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

77.4 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

6.7

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 856
  2. Fielder W. L., Singer J. Solubility, stability and electrochemical studies of sulfur-sulfide solutions in organic solvents. - NASA Technical paper 1245. - August 1978. - pp. 8
  3. Journal of Chemical and Engineering Data. - 2010. - Vol. 55, No. 9. - pp. 4080-4081
  4. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1294-1296
  5. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 54-55 [Russian]
  6. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 242 [Russian]
  7. Патент США US2,838,374 (от 10.06.1958)
  8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 85 [Russian]
  9. Самсонов Г.В., Дроздова С.В. Сульфиды. – М.: Металлургия, 1972. - pp. 26-28 [Russian]
  10. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 186 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru