It would seem that the easiest and most natural method – oxidation with oxygen of the metal sodium! However, there is a specificity. The fact that the oxidation of alkaline metals, flows so rapidly and quickly that in addition to the oxides formed peroxide. For example:
2Na + O2 = Na2O2 (sodium peroxide).
Moreover, it produces far more than that of sodium oxide (in the ratio of about 4:1). And in order to convert the peroxide into oxide of sodium, required careful heating in the presence of metallic sodium. The reaction takes place thus:
Na2O2 + 2Na = 2Na2O
Therefore, use other ways of obtaining this substance. For example, by the reaction of metallic sodium with a sodium nitrate (sodium nitrate, sodium nitrate). It flows like this:
2NaNO3 + 10Na = 6Na2O + N2В the course of this reaction sodium metal restores nitrogen with nitrate ion oxidation state +5, to pure nitrogen.
Sodium oxide can also be obtained by calcination of sodium carbonate (carbonate) at high temperatures (above 1000 degrees). The reaction is as follows:
Na2CO3 = Na2O + CO2
Very exotic and also unsafe, therefore not a recommended method of obtaining this substance: heat the mixture of sodium azide – sodium nitrate in a vacuum at a temperature below 350 degrees. The reaction proceeds like this:
5NaN3 + NaNO3 = 8N2+3Na2O