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Properties of substance:

sodium thiosulfate

Synonyms:

sodium thiosulphate

Group of substances:

inorganic

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

Na2O3S2

Structural formula as text:

Na2S2O3

Molar/atomic mass: 158.108

Decomposition temperature (°C):

220

Solubility (g/100 g of solvent):

ammonia liquid : 0.17 (25°C) [Ref.]
dimethylformamide: 0.08 (25°C) [Ref.]
ethanol: 0.0025 (20°C) [Ref.]
water: 49.7 (0°C) [Ref.]
water: 69.5 (20°C) [Ref.]
water: 104.1 (40°C) [Ref.]
water: 192.4 (60°C) [Ref.]

Multicomponent solubility (in wt%):

water 55.42%, sodium thiosulfate 42.92%, silver thiosulfate 1.66%, 25 °C, separating phase: Na2S2O3 * 5H2O [Ref.]
water 49.94%, sodium thiosulfate 42.99%, silver thiosulfate 7.07%, 25 °C, separating phase: Na2S2O3 * 5H2O [Ref.]
water 49.6%, sodium thiosulfate 42.27%, silver thiosulfate 8.13%, 25 °C, separating phase: Na3Ag(S2O3)2 * 2H2O [Ref.]
water 47.7%, sodium thiosulfate 36.49%, silver thiosulfate 15.81%, 25 °C, separating phase: Na3Ag(S2O3)2 * 2H2O [Ref.]
water 50.34%, sodium thiosulfate 27.79%, silver thiosulfate 21.87%, 25 °C, separating phase: Na5Ag3(S2O3)4 * 2H2O [Ref.]
water 89.26%, sodium thiosulfate 5.28%, silver thiosulfate 5.46%, 25 °C, separating phase: NaAg(S2O3) * H2O [Ref.]

Properties of solutions:

10% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.267 (20°)
  Density (g/cm3) = 1.0827 (20°)
  Index of refraction = 1.3538 (20°)
  Freezing point (°C) = -2.55
20% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 1.798 (20°)
  Density (g/cm3) = 1.174 (20°)
  Index of refraction = 1.3756 (20°)
40% (wt.), solvent - water
  Dynamic viscosity (mPa·s) = 5.758 (20°)
  Density (g/cm3) = 1.3827 (20°)
  Index of refraction = 1.4229 (20°)

Electrode potential:

S4O62- + 2e- → 2S2O32-, E = 0.09 V (water, °C)

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

-1123 (s) [Ref.]

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

155 (s) [Ref.]

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

146 (s) [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. Seidell A. Solubilities of inorganic and organic substances. - 2ed. - New York: D. Van Nostrand Company, 1919. - pp. 674-675
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 334 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 671 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 128-130 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 142-143 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru