POTASSIUM AMIDE KNH2

Properties of Potassium amide KNH2 :

White, melts without decomposition, decomposes on further heating. Oxidized in air, and turn yellow (the products are unknown). Not soluble in liquid ammonia. Hydrolyzed by water, reacts with acids.


Molar mass g/mol 55.12
Melting point °C 338

Obtaining potassium amide KNH2:

2K + 2 NH3(gas) = 2 KNH2 + H2 (65-105° С).

KH + NH3(gas) = KNH2 + H2 (300° С).

K2O + NH3(liquid) → (time) → KNH2↓ + KOH (- 50° С).


Chemical reactions with potassium amide:

6 KNH2 = 6K + 4NH3 + N2 (600-700° С).

KNH2 + 2 H2O (cold) = KOH + NH3-H2O

KNH2 + H2O (hot) = KOH + NH3↑.

KNH2 + 2 HCl (diluted) = KCl + NH4Cl.

2 KNH2 + 2 HNO3 = KN3 + KNO3 + 3H2O (boiling).

KNH2 + С (coke) = KCN + H2 (500-600° С).

KNH2 + NH4Cl = 2NH3 + KCl (-40° С, in the liquid of NH3).


 

Did you know?

Water expands by about 9% as it freezes.