Tetrasodium Pyrophosphate

Tetrasodium Pyrophosphate

Other names: sodium diphosphate, sodium pyrophosphate, disodium diphosphate, tetrasodium diphosphate, tetrasodium pyrophosphate, sodium pyrophosphate

CAS number: 7722-88-5
Molecular formula: Na₄P₂O₇
Molar mass: 265.90 g/mol
Appearance: white solid, powder, granules or crystals

Tetrasodium diphosphate is an inorganic sodium salt of diphosphoric acid, also known as tetrasodium pyrophosphate. The product most commonly occurs as a white powder, granules or crystals and is readily soluble in water, forming alkaline solutions. It is characterised by its ability to complex metal ions and stabilise the properties of aqueous solutions. It is used as a technical and laboratory reagent, a component of chemical mixtures, an auxiliary agent in technological processes and a raw material in formulations requiring the presence of a phosphate salt.

Chemical and physical properties

Form: solid, powder, granules or crystals

Colour: white

Odour: no characteristic odour

Solubility in water: readily soluble

Solubility in organic solvents: limited

Reaction of aqueous solution: alkaline

Chemical character: inorganic sodium salt of diphosphoric acid

Properties: complexing compound, component of buffering and stabilising systems

Stability: stable under normal storage conditions, protect from moisture

Applications

Technical processes: used as an auxiliary component in processes requiring the presence of phosphate salts.

Complexing of metal ions: used to bind metal ions in aqueous solutions and technical mixtures.

Regulation of solution properties: may influence pH, stability and functional properties of aqueous mixtures.

Laboratory applications: used as a reagent in research work, solution preparation and chemical procedures.

Chemical formulations: used as a component of technical mixtures, cleaning preparations, auxiliary systems and process solutions.

Source of phosphate ions: provides pyrophosphate ions in a readily soluble sodium salt form.

It is not intended for food, pharmaceutical or cosmetic applications unless the product has the appropriate quality and documentation required for such uses.

Handling and storage

Store in a tightly closed container in a dry, cool and well-ventilated place. Protect from moisture, direct sunlight and contamination of the product. Avoid dust formation during transferring and dosing. Close the container tightly after use to reduce caking and loss of product quality. Keep away from strong acids and chemically incompatible substances.