Preparation of Boric Acid

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BACKGROUND

Boric acid occurs naturally in volcanic jets of steam. The crude boric acid crystallises on cooling. Commercially this acid is prepared from sodium borate.¹

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This is prepared by treating borax with nitric acid and nitric acid is chosen over hydrochloric acid because sodium nitrate is more readily soluble than sodium chloride, and sulphuric acid is hard to wash out so not employed.

Aim: Aim of the experiment is to do the preparation of Boric acid.

Boric acid: H₃BO₃; Molecular weight: 61.84

REQUIREMENTS

Sample: Borax

Chemicals: Dilute H₂SO₄,

Distilled water

Apparatus: Hot water bath,

Filter paper,

Spatula.

PROCEDURE

In laboratory boric acid is prepared from sodium borate.

A mixture of concentrated sulphuric acid (6ml) and 30 ml of water was added in to the boiling solution of 30 gm of borax in 80ml of water. Filter the hot solution and keep for crystallization. Filter the crystalline boric acid, wash with distilled water until the washing is free from sulphate (Test with the barium chloride solution) and then dry at room temperature.¹

CONCLUSION

It can be used as local anti-infective agent. This acid can be used as a buffer. It can be used as vehicle for ophthalmic solutions.

REFERENCES

Inorganic medicinal and pharmaceutical chemistry., Block, Roche, Soine, Wilson
Indian Pharmacopoeia., 1996, 2016.

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