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Pyrophosphoric acid

Chemical Name:
Pyrophosphoric acid
DIPHOSPHORIC ACID;eizh;iphosphoricaci;PYROPHOSPHORIC ACID;Diphosphoric(V) acid;PYROPHOSPHORIC ACID, 90+%;PYROPHOSPHORIC ACID, TECH.;Pyrophosphoric acid syrupy;Pyrophosphoric acid technical grade;Pyrophosphoric acidDiphosphoric acid
Molecular Formula:
Molecular Weight:
MDL Number:
MOL File:
MSDS File:

Pyrophosphoric acid Properties

Melting point 61 °C
Density approximate 1.9g/ml (25℃)
storage temp. -20°C, Hygroscopic
solubility DMSO (Soluble)
pka 0.99±0.10(Predicted)
form white crystals
Water Solubility 709g/100mL H2O (23°C); soluble alcohol, ether [MER06]
Merck 13,8098
Stability Hygroscopic, Moisture Sensitive
CAS DataBase Reference 2466-09-3(CAS DataBase Reference)
EWG's Food Scores
EPA Substance Registry System


Risk and Safety Statements

Signal word  Danger
Hazard statements  ub8优游登录平台:H302-H314
Precautionary statements  ub8优游登录平台:P280-P305+P351+P338-P310
Hazard Codes  C
Risk Statements  22-34
Safety Statements  ub8优游登录平台:26-36/37/39-45
RIDADR  UN 3260 8/PG 2
WGK Germany  3
RTECS  JL6672500
HazardClass  8
PackingGroup  III
HS Code  28092000
NFPA 704
3 1

Pyrophosphoric acid price ub8优游登录平台:More Price(7)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 433314 Pyrophosphoric acid technical grade 2466-09-3 100g $75.5 2022-05-15 Buy
TRC P997700 Pyrophosphoric acid 2466-09-3 5g $120 2021-12-16 Buy
Usbiological 166092 Pyrophosphoric Acid 2466-09-3 5g $403 2021-12-16 Buy
Medical Isotopes, Inc. 72225 Pyrophosphoric acid 2466-09-3 5G $610 2021-12-16 Buy
Medical Isotopes, Inc. 72225 Pyrophosphoric acid 2466-09-3 25g $675 2021-12-16 Buy
Product number Packaging Price Buy
433314 100g $75.5 Buy
P997700 5g $120 Buy
166092 5g $403 Buy
72225 5G $610 Buy
72225 25g $675 Buy

Pyrophosphoric acid Chemical Properties,Uses,Production


Pyrophosphoric acid may be prepared by heating orthophosphoric acid at 215°C:
2H3PO4 → H4P2O7 + H2O
The acid solution in pure form can be obtained by ion exchange, passing an aqueous solution of sodium pyrophosphate, Na4P2O7, through a suitable cation exchange column.


The acid has four replacable H+ ions. Its dissociation constants indicate that two H+ ions are strongly acidic while the other two protons are weakly acidic. The first dissociation constant especially is very large:
H4P2O7 + H2O ↔ H3O+ + H3P2O7¯          Ka1 ~ 10–1
H3P2O7¯+ H2O ↔ H3O+ + H2P2O72–         Ka2 ~ 1.5x10–2
PHOSPHORIC ACID, PYRO 701H2P2O72¯ + H2O ↔ H3O+ + HP2O73–      Ka3 ~ 2.7x10–7
HP2O73¯ + H2O ↔ H3O+ + P2O74¯          Ka4 ~ 2.4x10–10
Pyrophosphoric acid forms acid salts, such as NaH3P2O7 and Na2H2P2O7.


Pyrophosphoric acid, also known under the name diphosphoric acid, is colorless, odorless, hygroscopic and is soluble in water, diethyl ether and ethyl alcohol. It is produced from phosphoric acid by dehydration. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.
H4P2O7 +H2O?2H3PO4
Upon heating, phosphoric acid loses water, being converted successively, and to some extent concurrently, into the pyro- and meta-acids:
2H3PO4?H4P2O7 +H2O
nH3PO4?(HPO3)n + [H2O]n

Chemical Properties

White to very pale yellow glassy solid

Physical properties

Colorless needles or liquid; hygroscopic. Crystallizes in two anhydrous forms: a metastable form melting at 54.3°C and a second and more stable form melting at 71.5°C; extremely soluble in cold water, reacting very slowly to form phosphoric acid; decomposing much faster in hot water; very soluble in alcohol and ether.


Catalyst, manufacture of organic phosphate esters, metal treatment, stabilizer for organic per- oxides.


Pyrophosphoric Acid has been shown to enhance the rate of pyrophosphate hydrolysis by nonenzymatic catlysis and by inorganic pyrophoshatase. Pyrophosphoric Acid can be used for the preparation of vanadyl pyrophosphato methoxide cluster anion. Pyrophosphoric Acid is used in anion binding of inorganic phosphates due to is ability to form complexes.


According to early investigators, the pyro-acid is formed as low as 100 °C, and the conversion is complete between 255 and 260 °C. Phosphorous oxychloride reacts with phosphoric acid in the following manner:
5H3PO4 + POC13?3H4P2O7 + 3HC1
A mixture of the ortho- and meta-acids may be condensed together to form the pyro-acid by heating on the water bath:
nH3PO4 +[HPO3]n?[H4P2O7]n


ChEBI: An acyclic phosphorus acid anhydride obtained by condensation of two molecules of phosphoric acid.

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View Lastest Price from Pyrophosphoric acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-08-12 ub8优游登录平台:Pyrophosphoric acid
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd
DIPHOSPHORIC ACID PYROPHOSPHORIC ACID Pyrophosphoric acid syrupy PYROPHOSPHORIC ACID, TECH. eizh PYROPHOSPHORIC ACID, 90+% Diphosphoric(V) acid Pyrophosphoric acidDiphosphoric acid Pyrophosphoric acid technical grade Pyrophosphoric acid Vetec(TM) reagent grade, 94% iphosphoricaci 2466-09-3 2466-9-3 2466/9/3 206975 H4P2O7 HO2POOPOOH2 Synthetic Reagents Inorganic Acids API intermediates