Phosphoric acid (sometimes called orthophosphoric acid) is a flammable chemical compound with the formula H3PO4. This acid has a clear, slightly yellowish, liquid appearance. Phosphoric acid is normally stored and distributed in solution. Phosphoric acid is very useful in the laboratory because of its resistance to oxidation, reduction and evaporation. Among other applications, phosphoric acid is used as an ingredient in soft drinks such as soda (food additive E-338), as a glue in dental prostheses, as a catalyst, in stainless metals and for phosphates used as water softeners, fertilisers and detergents. Widely used in chemical laboratories in the preparation of buffer solutions or pH regulators.
IDENTIFICATION AND PROPERTIES OF PHOSPHORIC ACID
Name: Phosphoric acid or phosphorous oxide trihydroxide.
Synonyms: Orthophosphoric acid, white phosphoric acid, hydrogen phosphate, ortho-phosphoramide.
- Physical state at 20ºC: Liquid
- Colour: Colourless
- Odour: Odourless
- Boiling temperature at atmospheric pressure: 108-171°C
- Vapour pressure at 20ºC: 4 Pa
- Density at 20°C: 1574-1791 kg/m3
- Dynamic viscosity at 20ºC: 1.1 -600 cP
- Decomposition temperature: >200ºC
- Melting point/freezing point: -18 -27ºC
- Flash point: Non-flammable (>60ºC)
USES PHOSPHORIC ACID
- Food additive
- Corrosion inhibitor
- Acid descaler
- pH modifier
- Chemical treatment of metal surfaces
- Professional user/industrial user only.
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