Sodium peroxide is both an oxidant and a reductant. 2mol(- 1 valence) of oxygen atom loses 2mol of electrons and is oxidized to oxygen, so it needs to be filled with 2 electrons.
At the same time, sodium peroxide is also an oxidant. 2mol of oxygen atom (-1valence) gains 2 mol of electrons and is reduced to -2 valence oxygen ions, so the double-line bridge should lose two electrons when the valence increases and gain two electrons when the valence decreases, not four.
Extended data:
chemical property
Sodium peroxide is an ionic compound, in which the valence of oxygen is-1 and that of sodium is+1. It can be dissolved in low-temperature sulfuric acid and then distilled under reduced pressure to obtain hydrogen peroxide.
Sodium peroxide can react with water and acid to produce sodium hydroxide and hydrogen peroxide (which can be decomposed into water and oxygen), and can also react with carbon dioxide to produce sodium carbonate and oxygen. ?
Sodium peroxide can also oxidize some metals. For example, molten sodium peroxide can oxidize iron into ferrate; Some acid-insoluble ores can be co-melted and decomposed.
In alkaline environment, sodium peroxide can oxidize +3 valence arsenic (As) to +5 valence and +3 valence chromium (Cr) to +6 valence. Trivalent chromium in some rock minerals can be removed by this reaction. Organic matter can also be oxidized into ethanol and carbonate under general conditions, and can also react violently with sulfide and chloride.
Sodium peroxide is also bleachable because it reacts with water to produce hydrogen peroxide. Because hydrogen peroxide has strong oxidation, some reagents such as magenta will be bleached, so it is irreversible to put sodium peroxide into phenolphthalein solution to turn red first and then fade.
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