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Borax "pentahydrate" has the formula Na 2 B 4 O 7 ·5H 2 O, which is actually a trihydrate Na 2 B 4 O 5 (OH) 4 ·3H 2 O. It is a colorless solid with a density of 1.880 kg/m 3 that crystallizes from water solutions above 60.8 °C in the rhombohedral crystal system .
Sodium borate is a generic name for any salt of sodium with an anion consisting of boron and oxygen, and possibly hydrogen, or any hydrate thereof. It can be seen as a hydrated sodium salt of the appropriate boroxy acid, although the latter may not be a stable compound.
This reaction is very fast, with characteristic time less than 10 μs. [13] Polymeric boron oxoanions are formed in aqueous solution of boric acid at pH 7–10 if the boron concentration is higher than about 0.025 mol/L. The best known of these is the tetraborate ion [B 4 O 7] 2−, found in the mineral borax:
Borax (Na 2 B 4 O 5 (OH) 4 · 8 H 2 O [2]) is a borate mineral found in evaporite deposits of alkaline lacustrine environments and as a surface efflorescence in arid regions. It is the chief mineral mined from the deposits at Boron, California and nearby locations, and is the chief source of commercial borax .
Tincalconite is a hydrous sodium borate mineral closely related to borax, and is a secondary mineral that forms as a dehydration product of borax. Its formula is Na 2 B 4 O 7 ·5H 2 O or Na 2 [B 4 O 5 (OH) 4]·3H 2 O. Tincalconite typically occurs as a fine grained white powder.
People are ingesting borax. Also known by its chemical name sodium borate decahydrate, borax is a salt typically used to kill ants and boost laundry detergent, among other household cleaning needs ...
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