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Name:  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

Phosphoric acid, also known as orthophosphoric acid or phosphoric(V) acid, is a mineral (inorganic) acid having the chemical formula H3PO4. 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

Product name
Diphosphoric acid
Molar mass 98.00 g/mol
Appearance white solid or colourless, viscous liquid
Density 1.685 g/ml (liquid)
Melting point 42.35 °C (anhydrous)
Boiling point 158 °C (decomp)
Solubility in water 548 g/100 mL
Viscosity 2.4–9.4 cP (85% aq. soln.)
Acidity (pKa) 2.12, 7.21, 12.67
MSDS ICSC 1008

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