Tetrasodium pyrophosphate
Chemical compound / From Wikipedia, the free encyclopedia
Tetrasodium pyrophosphate, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is an inorganic compound with the formula Na4P2O7. As a salt, it is a white, water-soluble solid. It is composed of pyrophosphate anion and sodium ions. Toxicity is approximately twice that of table salt when ingested orally.[3] Also known is the decahydrate Na4P2O7 · 10(H2O).[4]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Tetrasodium diphosphate | |
Other names
Pyrophosphate, Sodium pyrophosphate, Tetrasodium pyrophosphate (anhydrous), TSPP[1] | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ECHA InfoCard | 100.028.880 |
EC Number |
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E number | E450(iii) (thickeners, ...) |
PubChem CID |
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RTECS number |
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UNII |
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CompTox Dashboard (EPA) |
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Properties | |
Na4O7P2 | |
Molar mass | 265.900 g·mol−1 |
Appearance | Colorless or white crystals[2] |
Odor | odorless |
Density | 2.534 g/cm3 |
Melting point | 988 °C (1,810 °F; 1,261 K) (anhydrous) 79.5 °C (decahydrate) |
Boiling point | decomposes |
2.61 g/100 mL (0 °C) 6.7 g/100 mL (25 °C) 42.2 g/100 mL (100 °C) | |
Solubility | insoluble in ammonia, alcohol |
Refractive index (nD) |
1.425 |
Structure | |
monoclinic (decahydrate) | |
Thermochemistry | |
Heat capacity (C) |
241 J/mol K |
Std molar entropy (S⦵298) |
270 J/mol K |
Std enthalpy of formation (ΔfH⦵298) |
-3166 kJ/mol |
Gibbs free energy (ΔfG⦵) |
-3001 kJ/mol |
Hazards | |
Flash point | Non-flammable |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
none[2] |
REL (Recommended) |
TWA 5 mg/m3[2] |
IDLH (Immediate danger) |
N.D.[2] |
Related compounds | |
Other anions |
Trisodium phosphate Pentasodium triphosphate Sodium hexametaphosphate |
Other cations |
Tetrapotassium pyrophosphate |
Related compounds |
Disodium pyrophosphate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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