Sodium triphosphate

Appearance & Physical State: White powder Density: >1.5 g/cm3 (20ºC) Melting Point: 622ºC Water Solubility: 20 g/100 mL (20 ºC) Stability: Stable. Incompatible with strong oxidizing agents, strong acids. Hygroscopic. Storage Condition: Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture. Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP) is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products, especially detergents. Environmental problems associated with eutrophication are attributed to its widespread use. Sodium triphosphate Sodium tripolyphosphate.svg Names IUPAC name Pentasodium triphosphate Other names sodium tripolyphosphate, polygon, STPP Properties Chemical formula Na5P3O10 Molar mass 367.864 g/mol Appearance white powder Density 2.52 g/cm3 Melting point 622 °C (1,152 °F; 895 K) Solubility in water 14.5 g/100 mL (25 °C)