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Sodium peroxide
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<p>Sodium peroxide is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula <a href="/facts/Sodium/eYuSPu2V">Na</a>2<a href="/facts/Oxygen/acyn6o8r">O</a>2. This yellowish solid is the product of sodium ignited in excess oxygen. It is a strong base. This <a href="/facts/Metal_peroxide/nWNfoGBQ">metal peroxide</a> exists in several <a href="/facts/Hydrate/dev82l69">hydrates</a> and peroxyhydrates including Na2O2·2H2O2·4H2O, Na2O2·2H2O, Na2O2·2H2O2, and Na2O2·8H2O. The octahydrate, which is simple to prepare, is white, in contrast to the anhydrous material. </p>