CAS 7722-88-5 Sodium pyrophosphate(v) - Materials / Alfa Chemistry

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Sodium pyrophosphate(v)

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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

EC Number

231-767-1;231-767-1

Exact Mass

265.871003g/mol

Formal Charge

Heavy Atom Count

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

RTECS Number

UX7350000

UNII

O352864B8Z

Vapor Pressure

0 mm Hg (approx) (NIOSH, 2016);0 mmHg (approx)

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