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Anhydrous borax is sodium tetraborate proper, with formula Na 2 B 4 O 7. It can be obtained by heating any hydrate to 300 °C. [ 20 ] It has one amorphous (glassy) form and three crystalline forms – α, β, and γ, with melting points of 1015, 993 and 936 K respectively. α- Na 2 B 4 O 7 is the stable form.
This is a list of common chemical compounds with chemical formulae and CAS numbers, indexed by formula. ... borax: 1303-96-4 Ba(AlO 2) 2: barium aluminate: 12004-04-5 ...
The borate (BO 3) units may be polymerised similar to the SiO 4 unit of the silicate mineral class. ... boron atoms in a mineral's chemical formula (06.A are ...
Thus, for example, borax Na 2 B 4 H 20 O 17 would be 1Na 2 O·2B 2 O 3 ·10H 2 O, and boric acid B(OH) 3 would be 0Na 2 O·1B 2 O 3 ·1H 2 O = 2[B(OH) 3]. The elemental formula was often interpreted as a z -hydrate of an "anhydrous" salt without any hydrogen, namely Na 2 x B 2 y O 3 y · z H 2 O .
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 .
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:
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One known formula uses about a 1 to 10 ratio of H 3 BO 3 to NiSO 4, a very small portion of sodium lauryl sulfate and a small portion of H 2 SO 4. The solution of orthoboric acid and borax in 4:5 ratio is used as a fire retarding agent of wood by impregnation. [38]
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