Sodium pyrophosphate

Description

White, crystalline powder that is used as a Buffer, Emulsifier, Sequestrant, and Water softener. Sodium pyrophosphate, or TSPP, is used in de-inking newsprint, removing rust stains, scouring Wool, and dyeing textiles. TSPP is also included as an ingredient in many soaps, detergents, and cleansers.

Synonyms and Related Terms

TSPP; tetrasodium pyrophosphate

FTIR

Risks

• Toxic by inhalation.
• Contact may cause irritation.
• ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water. Decomposes in ethanol.

Composition	Na4P2O7
CAS	7722-88-5
Melting Point	880 C
Density	2.45 g/ml
Molecular Weight	mol. wt. = 266

Resources and Citations

• Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

• The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 9377