Phosphoric Acid - H3PO4

What is Phosphoric Acid?

Phosphoric Acid is a weak acid with chemical formula H3PO4. It is an acid containing four atoms of oxygen, one atom of phosphorus, and three atoms of hydrogen. It is also known as phosphoric(V) acid or orthophosphoric acid. It is present in teeth and bone and helps in metabolic processes. In its liquid form it appears as a clear, colorless solution and in its solid form, it appears as transparent, crystalline solid. As a sequestering agent, it helps in the binding of divalent cations. It is widely used in orthodontics and dentistry. Phosphoric acid is important in biogeochemistry and biochemistry. It is tribasic acid. The three regions are: the region where PH is equal to PK, the region where PH is equal to 4.7 and region where PH is equal to 9.8

Properties of Phosphoric Acid – H3PO4

H3PO4 Phosphoric Acid
Molecular Weight/ Molar Mass 97.994 g/mol
Density 1.88 g/cm³
Boiling Point 158 °C
Melting Point 42.35 °C

Phosphoric Acid structure – H3PO4

Phosphoric Acid structure

H3PO4 Uses (Phosphoric Acid)

  • It is used as fertilizers – around 90% of phosphoric acid produced is used as fertilizers
  • It is used in as a supplement feed for pigs, cattle, poultry
  • It is used in skin care products, cosmetics as a PH adjuster
  • It is used brewing, food and dairy industries as a sanitizing agent
  • It is used in beverages and food like jam and cola to acidify them
  • It is used to remove rust from the surface to metals

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Practise This Question

Which one of the following forms an alcohol with nitrous acid solution at 00C