Tetrasodium pyrophosphate, CAS No. 7722-88-5

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7722-88-5

Catalog No. EBD1988

CAS 7722-88-5

Name Tetrasodium pyrophosphate

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Basic Information

Synonyms: Diphosphoricacidtetrasodiumsalt Pyrophosphoricacidtetrasodiumsalt Sodiumdiphosphate Tetrasodiumpyrophosphate Sodiumpyrophosphateanhydrous Sodiumpyrophosphate TSPP TetrasodiumDiphosohate

Molecular Formula: Na4O7P2

Molecular Weight: 265.9

Categories: Functional Chemicals > Consumer & Industrial Chemicals > Water Treatment Chemicals Synthetic Chemistry > Basic Synthetic Reagents > Inorganic Compounds and Metal Salts

Product Description:

Sodium pyrophosphate, also known as tetrasodium pyrophosphate (TSPP), is an inorganic compound with the formula Na₄P₂O₇. It exists in both anhydrous and decahydrate forms. This white, water-soluble powder is a member of the polyphosphate family. Its primary industrial application is as a water softener and sequestrant in water treatment processes, where it effectively binds calcium and magnesium ions to prevent scale formation. It is also widely used as a buffering agent, emulsifier, and dispersant in the food industry (e.g., in processed meats and seafood). Furthermore, it serves as a cleaning agent in household and industrial detergents and finds use in metal treatment and ceramic production. In laboratory and synthetic chemistry, anhydrous sodium pyrophosphate functions as a source of the pyrophosphate anion (P₂O₇⁴⁻). It is employed as a buffering agent, a component in some biochemical assays, and a reagent in inorganic synthesis, particularly in the preparation of other metal pyrophosphates.

Physical Properties

Melting Point: 80 °C

Boiling Point: 93.8 °C

Density: 2.53 g/mL at 25 °C(lit.)

Solubility: H2O: 0.1 M at 20 °C, clear, colorless

Analytical Data

Appearance: white crystalline powder or colourless crystals