Sodium oxide

Sodium oxide . White solid looking chemical compound. It is used in ceramics and crystals. Its molecular formula is Na 2 O .


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  • 1 Properties
  • 2 uses
  • 3 Applications
  • 4 See also
  • 5 Sources


Among the physical properties are melting point in ° C 1132 , density of 2.27 g / cm3 and a molar mass of 61,979 .

As for the behavior in water , it reacts and the treatment with it produces sodium hydroxide , Na 2 O + H 2 NaOH of → 2 O.

The alkali metal oxides M 2 O (M = Na, K, Rb) crystallize in the structure of the antifluorite. In this ornament the positions of the anions and cations are reversed relative to their positions within CaF 2 .


The glass , in typical use, containing sodium oxide of about 15%, the other components are dioxide silicon and calcium oxide about 70% and 9%, respectively. Soda serves as a flow to lower the temperature at which the silicone melts.

The soda glass has a lower melting temperature against pure silicone, and has improved mechanical characteristics due to its slight increases in elasticity. These changes occur because silicon dioxide and soda react to sodium silicates in the form of the general Na of formula 2 [SiO 2 ] x [SiO 3 ] .

O forms when sodium is treated with oxygen. 4Na + O 2 Na from → 22O. Burning sodium in air will produce Na 2 O and about 20% sodium peroxide Na 2 O 2 . 6Na + 2O 2 Na from → 22O + Na 2 O 2 . Pure Na can be prepared by the reaction of the sodium liquid with NaNO 3 . 10Na + 2NaNO 3 Na from → 62O + N2.


Sodium oxide is an important component of crystals and glasses although it is added in the form of “soda” (sodium carbonate). Sodium oxide is not explicitly found as such in modern crystals, since they are complex interconnected polymers. The glass generally contains 15% sodium oxide, 70% silicon (silicon dioxide), and 9% lime (calcium oxide).

Sodium carbonate “soda” serves as a flux that reduces the temperature at which silicon melts. Soda glass melts at a lower temperature than pure silicon and has a somewhat higher elasticity. These changes are due to the fact that silicon dioxide and soda react forming sodium silicates with the following general formula: Na 2 [SiO 2 ] x [SiO 3 ]


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