Boric Acid - H3BO3

What is Boric Acid?

Boric Acid is a monobasic Lewis acid of boron with a chemical formula H3BO3. It is an acid containing four atoms of oxygen, one atom of phosphorus, and three atoms of hydrogen. It is also known as acidum boricum, hydrogen borate, boracic acid, and orthoboric acid. It is a weak acid and has antiviral, antifungal, and antiseptic properties. It is soluble in water and does not have a smell. It exists as a colorless crystal or in white powder form. We can prepare boric acid by reacting borax with hydrochloric acid. Wilhelm Homberg was the first to prepare boric acid from borax.

Properties of Boric Acid – H3BO3

H3BO3 Boric Acid
Molecular Weight/ Molar Mass 61.83 g·mol−1
Density 1.435 g/cm3
Boiling Point 158 °C
Melting Point 300 °C

Boric Acid structure – H3BO3


Uses of Boric Acid (H3BO3)

  • It is used in the manufacture of textile fiberglass
  • It is used in the production of the flat panel display
  • It is used to neutralize the active hydrofluoric acid
  • It is used by blacksmiths as welding flux
  • It is used in electroplating
  • It is used in the jewelry industry
  • It is used in the manufacture of silly putty
  • It is used as an Insecticidal
  • It is used as an antiseptic and antibacterial
  • It is used on carrom boards as a dry lubricant
  • It is used as a neutron poison in some nuclear plants
  • It is used to preserve grains like wheat and rice

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Practise This Question

Among the following which is an exchange reaction?

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