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Properties of substance:

potassium azide



skc-file

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

KN3

Structural formula as text:

KN3

Molar/atomic mass: 81.12

Melting point (°C):

354

Decomposition temperature (°C):

360

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ammonia liquid : very soluble [Ref.]
benzene: 0.15 (80°C) [Ref.]
diethyl ether: slightly soluble [Ref.]
ethanol: 0.16 (0°C) [Ref.]
ethanol: 0.137 (16°C) [Ref.]
ethanol 80%: 1.83 (0°C) [Ref.]
ethanol 80%: 5.93 (78.4°C) [Ref.]
methanol: very soluble [Ref.]
water: 41.4 (0°C) [Ref.]
water: 46.5 (10.5°C) [Ref.]
water: 48.9 (15.5°C) [Ref.]
water: 49.6 (17°C) [Ref.]
water: 105.7 (100°C) [Ref.]

Hygroscopic:

no

Numerical data:

Year of discovery: 1898

Density:

2.056 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    HN3 + KOH → KN3 + H2O

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

-1.7 (s)

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

104 (s)

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

76.9 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-82
  2. Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 79-81
  3. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 831
  4. Багал Л.И. Химия и технология инициирующих взрывчатых веществ. - М., 1975. - pp. 158-159 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 159, 696-697 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 80-81 [Russian]
  7. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 285 [Russian]
  8. Энергетические конденсированные системы. - Под ред. Жукова Б.П., 2-е изд. - М.: Янус-К, 2000. - pp. 19 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru