![]() However, the term may be applied also to the related compounds. The anion is not tetraborate 2− but tetrahydroxy tetraborate 2−, so the more correct formula should be Na 2B 4O 5(OH) 4♸H 2O. The term borax properly refers to the so-called "decahydrate" Na 2B 4O 7♱0H 2O, but that name is not consistent with its structure. Solubility of borax in some solvents Organic solvent This property is important for its uses in metallurgy and for the borax bead test of qualitative chemical analysis.īorax is soluble in a variety of solvents however, it is notably insoluble in ethanol. Molten borax dissolves many metal oxides to form glasses. Rem : Na 2B 4O 5(OH) 4♸H 2O + 2 HCl → 4 B(OH) 3 + 2 NaCl + 5H 2Oīorax is sufficiently stable to find use as a primary standard for acid-base titrimetry. Na 2B 4O 7♱0H 2O + 2 HCl → 4 H 3BO 3 + 2 NaCl + 5 H 2O Its reaction with hydrochloric acid to form boric acid is: ![]() īorax is also easily converted to boric acid and other borates, which have many applications. Conductivity is maximum along the b-axis. It is a proton conductor at temperatures above 21 ☌. In this structure, there are two four-coordinate boron centers and two three-coordinate boron centers. The structure of borax according to X-ray crystallography.įrom the chemical perspective, borax contains the 2− ion. These all appear to be related to the Sanskrit टांकण ṭānkaṇa. The words tincal and tincar were adopted into English in the 17th century from Malay tingkal and from Urdu/ Persian Arabic تنکار tinkār/tankār thus the two forms in English. That may have been from Medieval Latin baurach (another English spelling), borac(-/um/em), borax, along with Spanish borrax (> borraj) and Italian borrace, in the 9th century. The English word borax is Latinized: the Middle English form was boras, from Old French boras, bourras. īorax first came into common use in the late 19th century when Francis Marion Smith's Pacific Coast Borax Company began to market and popularize a large variety of applications under the 20 Mule Team Borax trademark, named for the method by which borax was originally hauled out of the California and Nevada deserts. Native tincal from Tibet, Persia, and other parts of Asia was traded via the Silk Road to the Arabian Peninsula in the 8th century AD. History īorax was first discovered in dry lake beds in Tibet. The terms tincal and tincar refer to native borax, historically mined from dry lake beds in various parts of Asia. In chemical laboratories, it is used as a buffering agent. It is commonly available in powder or granular form and has many industrial and household uses, including as a pesticide, as a metal soldering flux, as a component of glass, enamel, and pottery glazes, for tanning of skins and hides, for artificial aging of wood, as a preservative against wood fungus, and as a pharmaceutic alkalizer. It is a colorless crystalline solid, that dissolves in water to make a basic solution. 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.
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