Pyrophosphoric acid
Synonym(s):Diphosphoric acid
- CAS NO.:2466-09-3
- Empirical Formula: H4O7P2
- Molecular Weight: 177.98
- MDL number: MFCD00011343
- EINECS: 219-574-0
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-10-24 21:11:45
What is Pyrophosphoric acid?
Description
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.
The Uses of Pyrophosphoric acid
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.
The Uses of Pyrophosphoric acid
Catalyst, manufacture of organic phosphate esters, metal treatment, stabilizer for organic per- oxides.
What are the applications of Application
Pyrophosphoric acid is An enhanger of the rate of pyrophosphate hydrolysis by nonenzymatic catlysis and by inorganic pyrophoshatase
Definition
ChEBI: An acyclic phosphorus acid anhydride obtained by condensation of two molecules of phosphoric acid.
Preparation
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
Metabolism
Not Available
Properties of Pyrophosphoric acid
Melting point: | 61 °C |
Density | approximate 1.9g/ml (25℃) |
storage temp. | -20°C, Hygroscopic |
solubility | DMSO (Soluble) |
form | white crystals |
pka | 0.99±0.10(Predicted) |
color | white crystals, crystalline |
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) |
EPA Substance Registry System | Diphosphoric acid (2466-09-3) |
Safety information for Pyrophosphoric acid
Signal word | Danger |
Pictogram(s) |
Corrosion Corrosives GHS05 Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H302:Acute toxicity,oral H314:Skin corrosion/irritation |
Precautionary Statement Codes |
P280:Wear protective gloves/protective clothing/eye protection/face protection. P310:Immediately call a POISON CENTER or doctor/physician. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Pyrophosphoric acid
InChIKey | XPPKVPWEQAFLFU-UHFFFAOYSA-N |
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