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Sodium pyrophosphate(v)

Catalog Number
ACM7722885
CAS Number
7722-88-5
Product Name
Sodium pyrophosphate(v)
Structure
Category
Electrolytes
Description
Tetrasodium pyrophosphate appears as odorless, white powder or granules. mp: 995°C. Density: 2.53 g/cm³. Solubility in water: 3.16 g/100 mL (cold water); 40.26 g/100 mL boiling water. Used as a wool de-fatting agent, in bleaching operations, as a food additive. The related substance tetrasodium pyrophosphate decahydrate (Na4P2O7*10H₂O) occurs as colorless transparent crystals. Loses its water when heated to 93.8°C.;DryPowder; DryPowder, PelletsLargeCrystals; PelletsLargeCrystals;Colourless or white crystals, or a white crystalline or granular powder. The decahydrate effloresces slightly in dry air;ODOURLESS COLOURLESS OR WHITE CRYSTALS OR POWDER.;Odorless, white powder or granules. [Note: The decahydrate (Na4P2O7 ? 10H₂O) is in the form of colorless, transparent crystals.]
IUPAC Name
tetrasodium;phosphonato phosphate
Molecular Weight
265.9g/mol
Molecular Formula
Anhydrous: Na4P2O7; Decahydrate: Na4P2O7? 10H₂O;Na4O7P2;Na4O7P2
Canonical SMILES
[O-]P(=O)([O-])OP(=O)([O-])[O-].[Na+].[Na+].[Na+].[Na+]
InChI
InChI=1S/4Na.H4O7P2/c;;;;1-8(2,3)7-9(4,5)6/h;;;;(H2,1,2,3)(H2,4,5,6)/q4*+1;/p-4
InChI Key
FQENQNTWSFEDLI-UHFFFAOYSA-J
Boiling Point
Decomposes (NIOSH, 2016);Decomposes
Melting Point
1810 °F (NIOSH, 2016);Mp 993 ° (985 °);988 °C;988 °C;1810°F
Purity
anhydrous, Technical
Density
2.45 (NIOSH, 2016);2.534;Relative density (water = 1): 2.5;2.45
Solubility
7 % at 77° F (NIOSH, 2016);Soluble in water. Insoluble in ethanol;81.4 mg/mL at 25 °C;IN WATER: 2.61 G/100 ML @ 0 °C; 6.7 G/100 ML @ 25 °C; 42.2 G/100 ML @ 100 °C;(77°F): 7%
Application
Sodium pyrophosphate, also known as tetrasodium pyrophosphate or TSPP, serves multiple functions due to its versatile properties. It acts as a buffering, emulsifying, dispersing, and thickening agent, making it valuable across various industries. In the food industry, sodium pyrophosphate is widely utilized as an emulsifier, notably in processed cheese, and as a palatability enhancer in products like chicken nuggets, marshmallows, puddings, imitation crab, canned tuna, soy-based meat alternatives, and even cat food. Additionally, it plays a crucial role in the laboratory as a component of buffers for specific analyses, such as microcystin in soil samples. In personal care, it's a key ingredient in dental products for tartar control. Beyond these, sodium pyrophosphate is used in water softeners, metal cleaning, wool de-fatting, and as a builder in soaps and detergents. Historically, it was the active ingredient in Bakewell, a baking powder substitute during World War II shortages. Overall, its applications extend to dental hygiene, metal processing, and as an antimicrobial chelating agent, highlighting its importance in both industrial and everyday contexts.
Color/Form
CRYSTALS;COLORLESS, TRANSPARENT CRYSTALS OR WHITE POWDER;White powder or granules.
Complexity
124
Covalently-Bonded Unit Count
5
EC Number
231-767-1;231-767-1
Exact Mass
265.871003g/mol
Formal Charge
0
Heavy Atom Count
13
ICSC Number
1140
MeSH Entry Terms
anhydrous sodium pyrophosphate;disodium pyrophosphate;sodium diphosphate;sodium pyrophosphate;tetrasodium pyrophosphate;tetrasodium pyrophosphate, 32P2-labeled cpd;tetrasodium pyrophosphate, decahydrate;trisodium pyrophosphate
Monoisotopic Mass
265.871003g/mol
Odor
Odorless.
Other Experimental
AVAIL ALKALINITY AS NA2O 4.4%, TOTAL ALKALINITY 22.7%;MP: 79.5 °C; DENSITY: 1.82; PH OF 1% SOLN: 10.2 @ 25 °C /DECAHYDRATE/;COLORLESS, MONOCLINIC CRYSTALS; INSOL IN AMMONIA /DECAHYDRATE/;INSOL IN ALCOHOL /DECAHYDRATE/;SOLUBILITY IN WATER: 3.16 G/100 ML @ 0 °C; 6.23 G/100 ML @ 20 °C; 8.14 G/100 ML @ 25 °C; 21.83 G/100 ML @ 60 °C; 30.04 G/100 ML @ 80 °C /DECAHYDRATE/;INDEX OF REFRACTION: 1.450, 1.453, 1.460 /DECAHYDRATE/;SLIGHT EFFLORESCENCE IN DRY AIR /DECAHYDRATE/;HYDROLYZES TO ORTHOPHOSPHATE IN AQ SOLN, BUT RATE OF HYDROLYSIS IS MUCH SLOWER THAN FOR MORE ACID PYROPHOSPHATE; NO NOTICEABLE HYDROLYSIS WITHIN 60 HR AT 70 °C
Refractive Index
INDEX OF REFRACTION: 1.425
Rotatable Bond Count
0
RTECS Number
UX7350000
UNII
O352864B8Z
Vapor Pressure
0 mm Hg (approx) (NIOSH, 2016);0 mmHg (approx)
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