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Properties of substance:

potassium hydride

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

HK

Structural formula as text:

KH

Molar/atomic mass: 40.11

Decomposition temperature (°C):

400

Solubility (g/100 g of solvent):

ammonia liquid : insoluble [Ref.]
benzene: insoluble [Ref.]
carbon disulphide: insoluble [Ref.]
dibutyl ether: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: reaction [Ref.]
heptane: insoluble [Ref.]
hexane: insoluble [Ref.]
toluene: insoluble [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1808

Density:

1.47 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1]
    2K + H2 → 2KH

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

-63.4 (s)

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

-34 (s)

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

50.2 (s)

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

37.91 (s)

References:

  1. Алабышев А.Ф., Грачев К.Я., Зарецкий С.А., Лантратов М.Ф. Натрий и калий (получение, свойства и применение). - Л.: ГНТИХЛ, 1959. - pp. 275-278 [Russian]
  2. Жигач А.Ф., Стасиневич Д.С. Химия гидридов. - Л.: Химия, 1969. - pp. 65-66 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 68 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru