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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 .
Thus borax, for example, is still often described as a decahydrate Na 2 B 4 O 7 ·10H 2 O, with the implied anion [B 4 O 7] 2−, whereas the correct formula is Na 2 B 4 O 5 (OH) 4 ·8H 2 O, with anion [B 4 O 5 (OH) 4] 2−. The following table gives some of the crystalline sodium borates in this family. [2]
Disodium octaborate is traded either as a liquid concentrate, or as the tetrahydrate Na 2 B 8 O 13 ·4H 2 O, a white odorless powder. It is used as an insecticide , [ 3 ] [ 4 ] and as a fungicide and algicide , and as a fire retardant ., [ 5 ] [ 6 ] and as a boron micronutrient additive in fertilizers . [ 1 ]
It can be prepared by reacting water solutions of sodium carbonate Na 2 CO 3 and boric acid B(OH) 3 in mole ratio 1:10 and evaporating the resulting solution at 40 °C. It belongs to the monoclinic crystal system with symmetry group P 2 1 /c (C 2h 5 ) and parameters a = 1110.3 pm , b = 1643.7 pm, c = 1356.4 pm, α = 89.960°, β = 112.850° and ...
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 ...
Borate ions occur, alone or with other anions, in many borate and borosilicate minerals such as borax, boracite, ulexite (boronatrocalcite) and colemanite.Borates also occur in seawater, where they make an important contribution to the absorption of low frequency sound in seawater.
The hydrated tetraborate anion occurs in the mineral borax (sodium tetraborate octahydrate) with the formula Na 2 [B 4 O 5 (OH) 4]·8H 2 O. The borax chemical formula is also commonly written in a more compact notation as Na 2 B 4 O 7 ·10H 2 O. Sodium borate can be obtained in high purity and so can be used to make a standard solution in ...
B 4 Na 2 O 7.10H 2 O borax: 1303-96-4 Ba(AlO 2) 2: barium aluminate: 12004-04-5 ... CuSO 4 · 5H 2 O: copper(II) sulfate pentahydrate: 7758-99-8 CuSe: copper(II ...
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