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Properties of substance:

potassium metabisulfite

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

K2O5S2

Structural formula as text:

K2S2O5

Molar/atomic mass: 222.31

Decomposition temperature (°C):

190

Solubility (g/100 g of solvent):

diethyl ether: insoluble [Ref.]
ethanol: sparingly soluble [Ref.]
sulfur dioxide: 0.035 (0°C) [Ref.]
water: 27.5 (0°C) [Ref.]
water: 36.1 (10°C) [Ref.]
water: 44.5 (20°C) [Ref.]
water: 48.8 (25°C) [Ref.]
water: 63.9 (40°C) [Ref.]
water: 85.2 (60°C) [Ref.]
water: 107.9 (80°C) [Ref.]
water: 133 (100°C) [Ref.]

Density:

2.34 (20°C, g/cm3)

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

-1517.1 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 859
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 71 [Russian]
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 132-133 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 69 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 699 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru