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PHOSPHORIC ACID

Phosphoric acid, also known as orthophosphoric acid or phosphoric(V) acid, is a weak acid with the
It is normally encountered as a colorless, syrup of 85% concentration in water. The pure compound is a colorless solid.

All three hydrogens are acidic to varying degrees and can be lost from the molecule as H+ ions (protons). When all three H+ ions are removed, the result is an orthophosphate ion PO43−, commonly called “phosphate”. Removal of one or two proton
Phosphoric acid is commonly encountered in chemical laboratories as an 85% aqueous solution,

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Description

  • Food-grade phosphoric acid is used to acidify foods and beverages such as various colas and jams, providing a tangy or sour taste. Soft drinks containing phosphoric acid, which would include Coca-Cola, are sometimes called phosphate sodas or phosphates. Phosphoric acid in soft drinks has the potential to cause dental erosion. Phosphoric acid also has the potential to contribute to the formation of kidney stones, especially in those who have had kidney stones previously.
  • Specific applications of phosphoric acid include:
  • In anti-rust treatment by phosphate conversion coating or passivation
  • As an external standard for phosphorus-31 nuclear magnetic resonance.
  • In phosphoric acid fuel cells.
  • In activated carbon production.
  • In compound semiconductor processing, to etch Indium gallium arsenide selectively with respect to indium phosphide.
  • In micro fabrication to etch silicon nitrite selectively with respect to silicon dioxide.
  • As a pH adjuster in cosmetics and skin-care products.
  • As a sanitizing agent in the dairy, food, and brewing industries.

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