Tetrasodium pyrophosphate
Names | |
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IUPAC name
Tetrasodium diphosphate
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Other names
Pyrophosphate, Sodium pyrophosphate, Tetrasodium pyrophosphate (anhydrous), TSPP[1]
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Identifiers | |
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3D model (
JSmol ) |
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ChEBI | |
ECHA InfoCard
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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)
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1.425 |
Structure | |
monoclinic (decahydrate) | |
Thermochemistry | |
Heat capacity (C)
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241 J/mol K |
Std molar
entropy (S⦵298) |
270 J/mol K |
Std enthalpy of (ΔfH⦵298)formation |
-3166 kJ/mol |
Gibbs free energy (ΔfG⦵)
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-3001 kJ/mol |
Hazards | |
Flash point | Non-flammable |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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none[2] |
REL (Recommended)
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TWA 5 mg/m3[2] |
IDLH (Immediate danger) |
N.D.[2] |
Related compounds | |
Other anions
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Pentasodium triphosphate
Sodium hexametaphosphate |
Other cations
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Tetrapotassium pyrophosphate |
Related compounds
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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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Tetrasodium pyrophosphate, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is an
Use
Tetrasodium pyrophosphate is used as a
meat alternatives and cat foods and cat treats where it is used as a palatability
enhancer.
In
teeth. Tetrasodium pyrophosphate is used in commercial dental rinses before brushing to aid in plaque
reduction.
Tetrasodium pyrophosphate is sometimes used in household detergents to prevent similar deposition on clothing, but due to its phosphate content it causes eutrophication of water, promoting algae growth.
Production
Tetrasodium pyrophosphate is produced by the reaction of furnace-grade phosphoric acid with sodium carbonate to form disodium phosphate, which is then heated to 450 °C to form tetrasodium pyrophosphate:[5]
- 2 Na2HPO4 → Na4P2O7 + H2O
References
- ^ CDC - NIOSH Pocket Guide to Chemical Hazards
- ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0606". National Institute for Occupational Safety and Health (NIOSH).
- ^ Handbook of food toxicology, S. S. Deshpande, page 260
- ISBN 0-8493-8671-3
- ISBN 978-3527306732.