Ammonium phosphate dibasic

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Chemical structure

Ammonium phosphate dibasic.jpg

Ororless, colorless crystals that is used to fireproof textiles, paper, wood, and baskets. Ammonium phosphate dibasic is also used as a flux for soldering Tin, Copper, Brass, and Zinc.

Synonyms and Related Terms

secondary ammonium phosphate; diammonium hydrogen phosphate


  • Harmful if swallowed.
  • Contact causes irritation.
  • Fisher Scientific: SDS

Physical and Chemical Properties

  • Soluble in water forming solution with pH about 8.
  • Insoluble in alcohol, acetone.
  • Used for the detection of magnesium (Arnold 1984).
Composition (NH4)2HPO4
CAS 7783-28-0
Density 1.62 g/ml
Molecular Weight mol. wt. = 132.06

Resources and Citations

  • A. Arnold, "Determination of mineral salts from monuments", Studies in Conservation (29) 1984 (Detection of magnesium)
  • 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 576

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