Sodium perborate trihydrate
White, odorless solid
1.73 g · cm -3
Decomposition above 60 ° C
23 g · l-1 in water at 20 ° C
3250 mg · kg -1 ( LD50, Mouse, oral, monohydrate)
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Sodium is often called sodium borate tetrahydrate and given as a formula NaBO3 · 4 H2O. In the solid state, however, are no Natriumboroxide with crystal water, but annular peroxoborates.
Production and representation
Sodium is prepared in a two-step process starting from borax and sodium hydroxide:
Such as all compounds having peroxo (see peroxides, perborates ), including the sodium perborate is a strong oxidizing agent and is easy oxygen.
Sodium perborate is used as bleaching agent in many detergents. In water it decomposes to hydrogen peroxide and sodium hydrogen borate, wherein the hydrogen peroxide contributes to the oxidation of dyes. There will be more and more replaced in this role of sodium percarbonate, as the residual in the wash liquor sodium hydrogen borate is poorly filtered wastewater treatment plants, and so can enter surface water. A further application is the bleaching of teeth.
1904 a synthesis method of George François Jaubert and Otto Liebknecht ( the brother of Karl Liebknecht ) was independently developed for sodium perborate. 1907, sodium perborate as a component of Persil ( perborate silicate) on the market.
In stabilized by organophosphorus compounds form sodium is used as a preservative in ophthalmic preparations. The good tolerability of this preservative is that it breaks down into oxygen and water in the eye.
Sodium is considered to be teratogenic.