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Borax (also referred to as sodium borate, tincal (/ ˈ t ɪ ŋ k əl /) and tincar (/ ˈ t ɪ ŋ k ər /)) is a salt (ionic compound), a hydrated or anhydrous borate of sodium, with the chemical formula Na 2 H 20 B 4 O 17. [1] [a] It is a colorless crystalline solid that dissolves in water to make a basic solution.
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]
Boric acid, more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula B(OH) 3. It may also be called hydrogen orthoborate, trihydroxidoboron or boracic acid. [3] It is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite.
Borax crystals. Common borate salts include sodium metaborate (NaBO 2) and borax. Borax is soluble in water, so mineral deposits only occur in places with very low rainfall. Extensive deposits were found in Death Valley and shipped with twenty-mule teams from 1883 to 1889. In 1925, deposits were found at Boron, California on the edge of the ...
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 ...
Disodium octaborate is a borate of sodium, a chemical compound of sodium, boron, and oxygen — a salt with elemental formula Na 2 B 8 O 13 or (Na +) 2 [B 8 O 13] 2−, also written as Na 2 O·4B 2 O 3. It is a colorless crystalline solid, soluble in water.
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Sodium perborate is manufactured by reaction of borax Na 2 B 4 O 7 and sodium hydroxide NaOH to give sodium metaborate NaBO 2, which is then reacted with hydrogen peroxide to give hydrated sodium perborate: [3] [9] Na 2 B 4 O 7 + 2 NaOH → 4 NaBO 2 + H 2 O 2 NaBO 2 + 2 H 2 O 2 → Na 2 B 2 O 4 (OH) 4. A surfactant may be added to control ...