Diphosphoric acid

Synonyms: Iron (III) pyrophosphate; Diphosphoric acid iron(III) salt

Molecular Formula Fe₄.(P₂O₇)₃

Molecular Weight 745.21

CAS Registry Number 10058-44-3

EINECS 233-190-0

Orthophosphoric acid molecules can combine with themselves to form a variety of compounds which are also referred to as phosphoric acids, but in a more general way. The term phosphoric acid can also refer to a chemical or reagent consisting of phosphoric acids, usually orthophosphoric acid.Pure anhydrous phosphoric acid is a white solid that melts at 42.35 C to form a colorless, viscous liquid.Most people and even chemists refer to orthophosphoric acid as phosphoric acid, which is the IUPAC name for this compound. The prefix ortho is used to distinguish the acid from other phosphoric acids, called polyphosphoric acids. Orthophosphoric acid is a non-toxic, inorganic, rather weak triprotic acid, which, when pure, is a solid at room temperature and pressure. The chemical structure of orthophosphoric acid is shown above in the data table. Orthophosphoric acid is a very polar molecule; therefore it is highly soluble in water.

Speciafication

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