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Properties of substance:

sodium pyrosulfate

Group of substances:

inorganic

Physical appearance:

colorless crystals

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

Na2O7S2

Structural formula as text:

Na2S2O7

Molar/atomic mass: 222.1

Melting point (°C):

400.9

Decomposition temperature (°C):

460

Solubility (g/100 g of solvent):

water: soluble [Ref.]

Density:

2.66 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    Na2S2O7 + H2O → 2NaHSO4

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

-1938 (s)

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

40.8

References:

  1. Бок Р. Методы разложения в аналитической химии. - М.: Химия, 1984. - pp. 86 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 85 [Russian]
  3. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 364 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru