International name: Orthophosphoric Acid

Synonyms: phosphoric acid, o-phosphoric acid

Chemical formula: H3PO4

Appearance: colorless viscous liquid odorless

Production: Poland, Russia

Packing and storage: eurocube, canister 10/20 l; 3 years



Orthophosphoric acid (phosphoric acid) is an inorganic acid of medium strength, with the chemical formula H3PO4, which under standard conditions is colorless hygroscopic crystals.
At a temperature above +213 ° C, it is converted to pyrophosphoric acid H4P2O7. Very soluble in water. Typically, orthophosphoric (or simply phosphoric) acid is called 85% aqueous solution (colorless syrupy liquid odorless). It is also soluble in ethanol and other solvents.



The main property of orthophosphoric acid is its effect on the acid-base balance of the body, which leads to an increase in acidity. Increased acidity increases the risk of many diseases, including tooth decay and early osteoporosis. Another property of orthophosphoric acid (in high concentrations) is its ability to cause burns. Vapors of this acid can cause nasal bleeding and atrophic processes in the nasal mucosa, and in some cases can lead to tooth decay and a change in the blood formula.


The interaction of orthophosphoric acid occurs with:

  • Metal;
  • The main oxides;
  • Reasons;
  • Ammonia;
  • Salts of weak acids.


Industrial orthophosphoric acid is an important intermediate product for the production of phosphorus and complex fertilizers and technical phosphates, it is also widely used for the phosphating of metals, as a catalyst in organic synthesis. Food phosphoric acid is used for the preparation of non-alcoholic beverages, medicines, dental cements, etc.



Orthophosphoric acid is widely used for various purposes:

  • Promotes further prevention of corrosion;
  • As flux during soldering;
  • In agriculture - for the production of mineral fertilizers;
  • As part of freons (in industrial freezers);
  • For research in molecular biology;
  • In the production of household synthetic cleaning, washing and soothing agents;
  • In the aviation industry (in the composition of hydrofluids).

Safety requirements

Orthophosphoric acid is a fire and explosion-proof, non-flammable liquid.
Upon contact with the skin, it causes burns, inflammatory skin diseases, inhalation cough, eye contact burning. Hazard class - 2. When working, use protective suits, special rubber shoes, rubber gloves.



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