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

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