Pyrophosphoric Acid

Name:
Pyrophosphoric Acid
Detailed information:

Chemistry name:	diphosphoric acid
M Formula:	H4P2O7
Properties:
A viscous, syrupy liquid that tends to solidify on long standing at room temperature. When diluted with water it is rapidly converted into orthophosphoric acid. Mp 54C. Soluble in water.
Derivation:
By heating phosphoric acid at 250–260C. Further heating produces metaphosphoric acid.
Grade:
Technical.
Use:
Catalyst, manufacture of organic phosphate esters, metal treatment, stabilizer for organic peroxides.

See Polyphosphoric Acid.