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Properties of substance:

potassium nitrite

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

KNO2

Structural formula as text:

KNO2

Molar/atomic mass: 85.1

Melting point (°C):

387

Decomposition temperature (°C):

410

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ammonia liquid : soluble [Ref.]
ethanol: soluble (78°C) [Ref.]
ethyl acetate: insoluble [Ref.]
hydrogen fluoride : reaction [Ref.]
methyl acetate: insoluble [Ref.]
water: 279.5 (0°C) [Ref.]
water: 306.7 (20°C) [Ref.]
water: 334.8 (40°C) [Ref.]
water: 349.4 (60°C) [Ref.]
water: 376 (80°C) [Ref.]

Hygroscopic:

yes

Density:

1.91 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    2KNO2 → K2O + NO + NO2

Viscosity (mPa·s):

1.92 (427°C)
1.81 (447°C)

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

-370.6 (s)

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

-281.6 (s)

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

152.1 (s)

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

107.4 (s)

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

17

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 627-628
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 831-832
  3. Stern K.H. High temperature properties and thermal decomposition of inorganic salts with oxyanions. - CRC Press, 2001. - pp. 162
  4. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 114 [Russian]
  5. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 130-131 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 68 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 159-160 [Russian]
  8. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 80-81 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru