Pyrophosphoric acid
Pyrophosphoric acid (also known as diphosphoric acid) is an acid that has the chemical formula H4P2O7. It is an oxyacid of phosphorus and is a medium-strong inorganic acid.
Properties[edit]
Pyrophosphoric acid is a colorless, odorless, hygroscopic and non-volatile substance. It is soluble in water, alcohol, and diethyl ether. It is a tetraprotic acid, meaning it has four replaceable hydrogen atoms.
Preparation[edit]
Pyrophosphoric acid can be prepared by heating orthophosphoric acid. The reaction is as follows:
2 H3PO4 → H4P2O7 + H2O
Uses[edit]
Pyrophosphoric acid is used in several applications. It is used as a catalyst in the synthesis of ammonia and acetic acid. It is also used in the production of phosphate esters, plasticizers, and phosphate salts. In addition, it is used in the food industry as an emulsifier and buffering agent.
Safety[edit]
Pyrophosphoric acid is a corrosive substance and can cause burns if it comes into contact with the skin or eyes. It is also harmful if swallowed or inhaled.
See also[edit]
References[edit]
Pyrophosphoric acid gallery[edit]
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Pyrophosphoric acid 2D structure -
Pyrophosphoric acid 3D van der Waals model
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