Please note that the content of this book primarily consists of
articles available from Wikipedia or other free sources online.
Sodium peroxide is the inorganic compound with the formula Na2O2.
This solid is the product when sodium is burned. It is a strong
base and a potent oxidizing agent. It exists in several hydrates
and peroxyhydrates including Na2O2·2H2O2·4H2O, Na2O2·2H2O,
Na2O2·2H2O2, and Na2O2·8H2O.Sodium peroxide crystallizes with
hexagonal symmetry. Upon heating, the hexagonal form undergoes a
transition into a phase of unknown symmetry at 512 °C. With further
heating above the 675 °C melting point, the compound decomposes,
releasing O2, before reaching a boiling point.