|Other Name:||Borax Decahydrate||EINECS:||215-540-4|
|Molecular Weight:||381.37||Density:||1.69-1.72 G/m3|
sodium tetraborate decahydrate,
sodium borate decahydrate
1. Borax, also known as sodium borate, sodium tetraborate, or disodium
tetraborate, is an important boron compound, a mineral, and a salt of boric acid.
Powdered borax is white, consisting of soft colorless crystals that dissolve easily in
water. A number of closely related minerals or chemical compounds that differ in
their crystal water content are referred to as borax, but the word is usually used to
refer to the decahydrate. Commercially sold borax is partially dehydrated.
Borax is a component of many detergents, cosmetics, and enamel glazes. It is
compound, in the manufacture of fiberglass, as a flux in metallurgy, neutron-
capture shields for radioactive sources, a texturing agent in cooking, as a precursor
for other boron compounds, and along with its inverse, boric acid, is useful as an
2. In artisanal gold mining, the borax method is sometimes used as a substitute for
toxic mercury in the gold extraction process. Borax was reportedly used by gold
miners in parts of the Philippines in the 1900s.
Borax was first discovered in dry lake beds in Tibet and was imported via the Silk
Road to the Arabian Peninsula in the 8th Century AD.Borax first came into common
use in the late 19th century when Francis Marion Smith's Pacific Coast Borax
Company began to market .
The structure of the anion [B4O5(OH)4]2− in borax
The term borax is often used for a number of closely related minerals or chemical
compounds that differ in their crystal water content:
· anhydrous sodium tetraborate, Na2B4O7
· sodium tetraborate pentahydrate, Na2B4O7·5H2O
· setraborate decahydrate, Na2B4O7·10H2O
Borax is generally described as Na2B4O7·10H2O. However, it is better formulated
as Na2[B4O5(OH)4]·8H2O, since borax contains the [B4O5(OH)4]2− ion. In this
structure, there are two four-coordinate boron atoms (two BO4 tetrahedra) and two
three-coordinate boron atoms (two BO3 triangles).
Borax is also easily converted to boric acid and other borates, which have many
applications. Its reaction with hydrochloric acid to form boric acid is:
Na2B4O7·10H2O + 2 HCl → 4 H3BO3 + 2 NaCl + 5 H2O
The "decahydrate" is sufficiently stable to find use as a primary standard for acid
When borax is added to a flame, it produces a yellow green color.Borax is not used
for this purpose in fireworks due to the overwhelming yellow color of sodium. Boric
acid is used to color methanol flames a transparent green.
Borax Decahydrate is the refined form of natural sodium borate. Composed of boric
oxide (B2O3), sodium oxide, and water, it is a mild, alkaline salt, white and
crystalline, with excellent buffering and fluxing properties. Available in powder or
granular form, Borax Decahydrate is an important multifunctional source of B2O3,
particularly for processes in which the simultaneous presence of sodium is
|Properties||White power or crystal granular|
Specification for borax decahydrate powder 95%
Borax Decahydrate is chemically stable under normal storage conditions. It will
slowly lose water of crystallisation if exposed to a warm, dry atmosphere.
Conversely, exposure to a humid atmosphere can cause recrystallisation at particle
contact points, resulting in caking. When storing the product, care should therefore
be taken to avoid wide fluctuations in temperature and humidity, and to ensure that
the packaging is not damaged. Dissolved in water, Borax Decahydrate hydrolyzes
to give a mildly alkaline solution. It is thus capable of neutralizing acids. It also
combines with strong alkalis to form compounds of lower pH. The relatively
constant pH of Borax Decahydrate solutions makes it an excellent buffering agent.
1. Ingredient in enamel glazes
2. Component of glass, pottery, and ceramics
3. Used as an additive in ceramic slips and glazes to improve fit on wet,
greenware, and bisque.
4. As a micronutrient fertilizer to correct boron-deficient soils.
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