Borax Formula

What is Borax?

Borax is a compound consisting of an elementary substance called boron, united to oxygen and soda.

Borax formula, also known as sodium borate formula, sodium tetraborate formula or disodium tetraborate formula is explained in this article. Borax is a soft, colorless compound of Boron and can be dissolved in water. The main forms of borax are anhydrous and decahydrate salt and sometimes as a pentahydrate salt.

Borax Chemical Formula

The most common form of borax is Borax decahydrate which has 4 Boron atoms, 17 oxygen atoms, 2 sodium atoms, and 20 hydrogen atoms. The Chemical and molecular formula of Borax is given as the following-

Chemical Formula of Borax Molecular Formula of Borax
Na2B4O7• 10H2O






Natural sources of Borax

  • Borax is naturally found in evaporite deposits which are produced by the recurrent evaporation of seasonal lakes.
  • Naturally occurring borax is purified by recrystallization.
  • Borax can also be synthesized from boron compounds.

Borax Structural Formula

Borax Structural Formula

Structure of Borax

Borax Reaction

Borax is mainly used in laundry and other cleaning products. It is also used to prepare boric acid by reacting with hydrochloric acid, i.e. HCl. This process was first used by Wilhelm Homberg. Apart from this, borax is also used in food, chemical, and pharmaceutical industries.

Borax reacts with hydrochloric acid to produce boric acid. The reaction is as follows:

Na2B4O7·10H2O + 2 HCl → 4 B(OH)3 + 2 NaCl + 5 H2O

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Frequently asked questions

1. What is the other name of Borax?

Ans: Borax is also known as Sodium tetraborate.

2. Write the molecular formula of borax.

Ans: H20B4Na2O17

3. Write the chemical formula of borax.

Ans: Na2B4O7• 10H2O

4. Where was borax discovered?

Ans: It was first discovered in the dry lake beds of Tibet.

5. List two uses of borax.

Ans: Borax is used to kill insects such as ants. It is also used to get rid of molds and stains.

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