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Properties of substance:

sodium sulfite

Synonyms:

sodium sulphite

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

Na2O3S

Structural formula as text:

Na2SO3

Molar/atomic mass: 126.04

Melting point (°C):

911

Decomposition temperature (°C):

700

Solubility (g/100 g of solvent):

ammonia liquid : 0.17 (25°C) [Ref.]
benzonitrile: insoluble [Ref.]
ethanol: sparingly soluble [Ref.]
ethyl acetate: insoluble [Ref.]
methyl acetate: insoluble [Ref.]
sulfur dioxide: 0.023 (0°C) [Ref.]
water: 14.4 (0°C) [Ref.]
water: 26.1 (20°C) [Ref.]
water: 37.4 (40°C) [Ref.]
water: 33.2 (60°C) [Ref.]
water: 29 (80°C) [Ref.]
water: 26.6 (100°C) [Ref.]

Density:

2.633 (15°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    2CuCl2 + Na2SO3 + H2O → 2CuCl + Na2SO4 + 2HCl
  2. [Ref.1]
    3CuSO4 + 4Na2SO3 + 2H2O → Cu2SO3 * CuSO3 * 2H2O + 4Na2SO4 + SO2

Electrode potential:

SO42- + H2O + 2e- → SO32- + 2OH-, E = -0.93 V (water, 25°C)

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

-1090 (s)

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

-1002 (s)

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

146 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

120.1 (s)

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

26

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1296-1298, 1300
  2. Stern K.H. High temperature properties and thermal decomposition of inorganic salts with oxyanions. - CRC Press, 2001. - pp. 71
  3. Zeitschrift fur anorganische und allgemeine Chemie. - 1924. - Vol. 139, No. 1. - pp. 275-280 [DOI: 10.1002/zaac.19241390116]
  4. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 166-167 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 85 [Russian]
  6. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 365 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru