Ammonium Sodium Phosphate
Title: Ammonium Sodium Phosphate
CAS Registry Number: 13011-54-6
CAS Name: Monoammonium, monosodium phosphoric acid salt
Additional Names: sodium ammonium phosphate; microcosmic salt; salt of phosphorus; phosphorsalz
Molecular Formula: H5NNaO4P
Molecular Weight: 137.01
Percent Composition: H 3.68%, N 10.22%, Na 16.78%, O 46.71%, P 22.61%
Line Formula: NaNH4HPO4
Derivative Type: Tetrahydrate
Properties: Odorless, monoclinic crystals or granules. Efflorescent in air with loss of some NH3. d 1.544. mp ~80° when rapidly heated. Prolonged heating produces NaPO3. Sol in about 5 parts cold, 1 part boiling water. Practically insol in alcohol. pH of 5% aq soln 7.8 to 8.2.
Melting point: mp ~80° when rapidly heated
Density: d 1.544
Use: As reagent for determination of Mg, Zn, and in blowpipe analysis. For standardizing uranium solns. In the prepn of ammonium phosphate and ammonium molybdate stock solns.
Status: This monograph has been retired and is no longer subject to revision or update.

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