Sodium tripolyphosphate
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Description
White, slightly hygroscopic powder. Sodium tripolyphosphate is used as a sequestrant and emulsifier in water softeners and detergents. It binds calcium and magnesium ions without forming a precipitate.
Synonyms and Related Terms
STP; STPP; pentasodium triphosphate; triphosphoric acid pentasodium salt; sodium triphosphate
Risks
- Contact causes irritation.
- Ingestion causes vomiting.
- Fisher Scientific: MSDS
Physical and Chemical Properties
Soluble in water (pH = 9.7 - 9.8 for a 1% solution).
| Composition | Na5P3O10 |
|---|---|
| CAS | 7758-29-4 |
| Melting Point | 622 C |
| Molecular Weight | mol. wt. = 367.86 |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8446
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998