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ChemicalBook CAS DataBase List POTASSIUM NITRITE
7758-09-0

POTASSIUM NITRITE synthesis

4synthesis methods
Potassium nitrite may be prepared by fusion of nitrate with lead:
KNO3+ Pb →KNO2+ PbO
The product is extracted with water and allowed to crystallize. Filtration separates nitrite from insoluble lead oxide.
Potassium nitrite also may be obtained by high temperature thermal decomposition of nitrate:
2KNO3→2KNO2+ O2↑.
-

Yield:-

Reaction Conditions:

with nitrous gas in water;excluding air; nitrous gas, obtained by redn. of HNO3 by As2O3 or starch, introduced in concd. soln. until complete neutralization; NO in small excess compared to NO2;

References:

Oswald, M. [Annales de Chimie (Cachan, France),1914,vol. 1,p. 48]

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