Science Fair Project Encyclopedia
|Name||Sodium tetraborate decahydrate|
|Formula weight||381.4 amu|
|Melting point||Decomposes at 348 K (75 °C)|
|Density||1.7 ×103 kg/m3|
|Solubility||55 g in 100g water|
|Ingestion||GI irritation, large doses may be fatal.|
|Inhalation||May cause irritation.|
|Skin||May cause irritation.|
|Eyes||May cause irritation.|
|More info||Hazardous Chemical Database|
| SI units were used where possible. Unless otherwise stated, standard conditions were used.
Disclaimer and references
Borax, (Na2B4O7·10H2O, sodium borate or sodium tetraborate) is an important boron compound. It is a soft white many-sided crystal that dissolves easily in water. If left exposed to dry air, it slowly loses its water of hydration and becomes the white chalky mineral tincalconite (Na2B4O7·5H2O). Commercially sold borax is usually partially dehydrated.
Borax occurs naturally in evaporite deposits produced by the repeated evaporation of seasonal lakes (see playa). The most commercially important deposits are found near Boron, California and other locations in the American southwest, the Atacama desert in Chile, and in Tibet. Borax may also be produced synthetically from other boron compounds.
Borax is widely used in detergents, water softeners, soaps, disinfectants, and pesticides. It is used in making enamel glazes, glass and strengthening pottery and ceramics. It is also easily converted to boric acid or borate, which have many applications.
- Slime Includes a recipe for homemade slime which uses borax
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