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Properties of substance:

sodium thiosulfate pentahydrate

Synonyms:

sodium thiosulphate pentahydrate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

H10Na2O8S2

Structural formula as text:

Na2S2O3 * 5H2O

Molar/atomic mass: 248.17

Melting point (°C):

48.5

Decomposition temperature (°C):

100

Solubility (g/100 g of solvent):

ethanol: 0.0034 (20°C) [Ref.]
water: 50.2 (0°C) [Ref.]
water: 59.7 (10°C) [Ref.]
water: 70.1 (20°C) [Ref.]
water: 75.9 (25°C) [Ref.]
water: 91.2 (35°C) [Ref.]
water: 123.9 (45°C) [Ref.]
water: 191.3 (60°C) [Ref.]
water: 245 (100°C) [Ref.]

Density:

1.715 (20°C, g/cm3)

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

-2621 (s) [Ref.]

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

313.5 (s) [Ref.]

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

360.7 (s) [Ref.]

Enthalpy (heat) of fusion ΔfusH (kJ/mol)

23.4 (s) [Ref.]

Enthalpy (heat) of solution ΔsolH (kJ)

47.42 (s) [solvent: water, 18°C, 1 mol in 400 mol of water] [Ref.]

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 1068-1070
  2. Bhattacharjee C., Ismail S., Ismail K. Density and viscosity of sodium thiosulfate pentahydrate (Na2S2O3*5H2O) + potassium nitrate melt / Journal of Chemical and Engineering Data. - 1986. - Vol. 31, No. 1. - pp. 117-118 [DOI: 10.1021/je00043a034]
  3. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1316-1319
  4. Беликов В.Г. Учебное пособие по фармацевтической химии. - М.: Медицина, 1979. - pp. 31 [Russian]
  5. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 168-169 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - 3-е изд. - Л.: Химия, 1991. - pp. 89 [Russian]
  7. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 85 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru