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Properties of substance:

sodium azide



skc-file

Group of substances:

inorganic

Physical appearance:

white trigonal crystals

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

N3Na

Structural formula as text:

NaN3

Molar/atomic mass: 65.01

Decomposition temperature (°C):

275

Solubility (g/100 g of solvent):

acetone: practically insoluble [Ref.]
ammonia liquid : very soluble [Ref.]
benzene: 0.1 (80.1°C) [Ref.]
carbon tetrachloride: practically insoluble [Ref.]
chloroform: practically insoluble [Ref.]
cyclohexane: practically insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: 0.28 (0°C) [Ref.]
ethanol: 0.58 (78°C) [Ref.]
ethanol abs.: 0.315 (16°C) [Ref.]
ethyl acetate: practically insoluble [Ref.]
hexane: practically insoluble [Ref.]
methanol: 3.14 (25°C) [Ref.]
sodium hydroxide 50%: 2 (17°C) [Ref.]
trichloroethylene: practically insoluble [Ref.]
water: 27.6 (-15.1°C) [Ref.]
water: 38.9 (0°C) [Ref.]
water: 40.8 (20°C) [Ref.]
water: 55.3 (100°C) [Ref.]

Properties of solutions:

1% (wt.), solvent - water
  Density (g/cm3) = 1.004 (20°)
2% (wt.), solvent - water
  Density (g/cm3) = 1.01 (20°)
4% (wt.), solvent - water
  Density (g/cm3) = 1.022 (20°)
6% (wt.), solvent - water
  Density (g/cm3) = 1.034 (20°)
8% (wt.), solvent - water
  Density (g/cm3) = 1.047 (20°)
10% (wt.), solvent - water
  Density (g/cm3) = 1.059 (20°)
12% (wt.), solvent - water
  Density (g/cm3) = 1.072 (20°)
14% (wt.), solvent - water
  Density (g/cm3) = 1.085 (20°)
16% (wt.), solvent - water
  Density (g/cm3) = 1.099 (20°)
18% (wt.), solvent - water
  Density (g/cm3) = 1.112 (20°)
20% (wt.), solvent - water
  Density (g/cm3) = 1.126 (20°)
22% (wt.), solvent - water
  Density (g/cm3) = 1.14 (20°)
24% (wt.), solvent - water
  Density (g/cm3) = 1.155 (20°)
30% (wt.), solvent - water
  Density (g/cm3) = 1.202 (20°)

Numerical data:

Minimum lethal dose (MLD, mg/kg): 44
Minimum lethal dose (MLD, mg/kg): 20


Density:

1.85 (20°C, g/cm3)

Reactions of synthesis:

  1. Yeild 60%. [Ref.1aster]
    NaNO3 + 3NaNH2 → NaN3 + 3NaOH + NH3

Reactions:

  1. Yeild 30%. [Ref.1]
    2NaN3 + 2F2 → N2F2 + 2NaF + 2N2
  2. [Ref.1aster]
    NaN3 + CS2 → N3CSSNa
    N3CSSNa + HCl → N3CSSH + NaCl
  3. [Ref.1]
    2NaN3 + 3F2 + Cl2 → 2NF2Cl + 2NaF + 2N2
  4. [Ref.1aster]
    NaN3 + H2SO4 → HN3 + NaHSO4
  5. [Ref.1aster]
    P3N3Cl6 + 6NaN3 → P3N3(N3)6 + 6NaCl

Electrode potential:

3N2 + 2e- → 2N3-, E = -3.4 V (water, 25°C)

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

21.3 (s)

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

99.4 (s)

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

70.5 (s)

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

76.6 (s)

LD50 (mg/kg):

45 (rabbits, onto the skin)
45 (rats, subcutaneous)
60 (rats, onto the skin)
47.5 (rats, intratracheal)
23 (mice, subcutaneous)

References:

  1. Багал Л.И. Химия и технология инициирующих взрывчатых веществ. - М., 1975. - pp. 154-158 [Russian]
  2. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 99-100 [Russian]
  3. Вредные химические вещества: Неорганические соединения элементов V-VIII групп. Справочник. - Л., 1989. - pp. 25-26 [Russian]
  4. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 405 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 83 [Russian]
  6. Ситтиг М. Натрий, его производство, свойства и применение. - М.: ГИЛОАНТ, 1961. - pp. 220-222 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 117, 666 [Russian]
  8. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 132-133 [Russian]
  9. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 214, 544 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru