Sodium di-hydrogen o-phosphate dihydrate USP/Ph.Eur 5KG Go Back

CASR

: 13472-35-0

Molecular Formula

: NaH2PO4.2H2O

Molecular Weight

: 156.01
Specifications  
Description: Colorless crystals or white, crystalline powder is odorless and is slightly deliquescent. Its solutions are acid to litmus and effervesce with sodium carbonate
Solubility: Freely soluble in water; practically insoluble in alcohol.
Identification A (By Chemical test): Solution should be slightly acid
Identification A (Sodium): A dense whiter precipitate should form
Identification (Phosphate 1): A neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide
Identification (Phosphate 2): A yellow precipitate should form of which color does not changes by boiling and which dissolves on addition of ammonia.
Identification (Phosphate 3): A yellow color should develop
Appearance of solution: Clear and colorless solution
pH: 4.2 - 4.5
Insoluble Substances: NMT 0.2%
Chlorides: NMT 0.014%
Sulphate (SO4): 300ppm max
Aluminium, Calcium and Related Elemant: The sample solution should not become turbid when rendered slightly alkaline to litmus paper with 6N ammonium hydroxide.
Water: 18.0% - 26.5%
Loss on drying,130°C: 21.5% - 24.0%
Reducing substances: The color of permanganate should not completely discharge
Arsenic (As): 2ppm max
Iron (Fe): 10ppm max
Assay (on dried basis): 98.0% - 100.5%
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