SODIUM NITRATE NaNO3

Properties of sodium nitrate NaNO3:

Soda (Chilean) nitrate, nitratin. White, hygroscopic. Melts without decomposition, on further heating decomposes. Readily soluble in water with high endo-effect (without hydrolysis). Crystalline hydrates do not form. Practically insoluble in concentrated nitric acid. Strong oxidizing agent at sintering. In solution recovered only by atomic hydrogen.

 

Obtaining sodium nitrate NaNO3:

NaOH + HNO3(diluted) = NaNO3 + H2O.

2 NaOH (cold) + NO + NO2 = 2 NaNO2 + H2O

4 NaOH (hot) + 4NO2 + O2 = 4 NaNO3 + 2H2O.

4 NO2 + O2 + H2O = 4 HNO3

4 NO2 + O2 + 4NaOH(hot) = 4 NaNO2 + 2H2O.

2 NO2 (liquid) + Na = NO↑ + NaNO2

NaNO2 + H2O2 (hot) = NaNO3 + H2O.

 

Reactions with sodium nitrate NaNO3:

2 NaNO3 = 2 NaNO2 + О2 (380—500° С; impurity Na2O, NO2).

NaNO3 (diluted) + 4 Н2О = [Na(H2O)4]+ + NO3- (pH 7).

NaNO3 + 2H0 (Zn, diluted НСl) = NaNO2 + H2O (normal temp.)

NaNO3 + 8H0 (Zn, conc. NaOH) = NH3↑ + 2H2O + NaOH (boiling).

2 NaNO3 + (NH4)2SO4 = Na2SO4 + 2 N2O + 4H2O (230—300° С).

8 NaNO3 + 10Na = N2 + 6 Na3NO4 (250° С, vacuum)

NaNO3 + Na2O= Na3NO4 (310—320° С)

NaNO3 + Pb = PbO + NaNO2 (t>350° С).

3 NaNO3 + 4 NaOH + Cr2O3 = 2 Na2CrO4 + 3 NaNO2 + 2H2O (350—400° С).