Salicylic Acid - C7H6O3

What is Salicylic Acid?

Salicylic Acid is a type of beta hydroxy acid (BHA) and phenolic acid with a chemical formula C7H6O3. It is a BHA found as a natural compound in plants. It functions as a plant hormone. This lipophilic monohydroxybenzoic acid is a derivative of salicin metabolism. It is a crystalline organic carboxylic acid with keratolytic, bacteriostatic and fungicidal properties. It is poisonous when consumed in large. It can be used as an antiseptic and as a food preservative when consumed in small quantities. It consists of a carboxyl group COOH. It is odorless and has no color.

Properties of Salicylic Acid – C7H6O3


Salicylic Acid

Molecular Weight/ Molar Mass

138.121 g/mol


1.44 g/cm³

Boiling Point

211 °C

Melting Point

158.6 °C

Salicylic Acid structure – C7H6O3

Salicylic Acid structure

C7H6O3 Uses (Salicylic Acid)

  • It is used in toothpaste as an antiseptic
  • In the medical field, it is used to remove the outer layer of the skin
  • IIt is used in the treatment of acne, dandruff, and the wrath
  • It is used as a preservative
  • It is used in the production of drugs like aspirin
  • It is used as a balm to reduce muscle and joint pain
  • It is used to relieve pain caused during mouth ulcer
  • It is used as a key additive in skin care products

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Practise This Question

Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 Å. 

Assuming density of the oxide as , then the number of 

 ions present in each unit cell will be

[MP PET 2000]