Monobasic sodium phosphate monohydrate USP/BP 5KG Go Back


: 10049-21-5

Molecular Formula

: NaH2PO4.H2O

Molecular Weight

: 137.99
Appearance/Description: Colorless crystals or a white crystalline powder. Its solutions are acid to litmus and effervesce with sodium carbonate.
Solubility: Very soluble in water; very slightly soluble in ethanol (96%). practically insoluble in alcohol.
Identification (By chemical test): Solution should be slightly acid.
Identification (Phosphate 1): A neutral solution should yield yellow precipitate with silver nitrate solution that soluble in 2N nitric acid and 6 N ammonium hydroxide.
Identification (Phosphate 2): With ammonium molybdate solution, acidified solutions should yield a yellow precipitate with ammonium molybdate solution which should soluble in 6N ammonium hydroxide.
Identification (Sodium): A dense precipitate should form.
Identification D (By Loss on drying): 11.5% - 14.5%
Acidity / PH: pH of the solution should be between 4.2 and 4.5
Clarity and colour of solution: Clear and colorless solution
Arsenic (As): NMT 2ppm
Iron (Fe): NMT 10ppm
Sulphate (SO4): NMT 300pm
Chloride (Cl): NMT 0.014%
Reducing substances: The solution retains a slight red color.
Loss on drying at 130°C: 11.5% - 14.5%
Water: 10.0% - 15.0%
Assay (Dried substance): 98.0% - 100.5%
Assay (Anhydrous basis): 98.0% - 103.0%
Insoluble Substances: NMT 0.2%
Aluminium, Calcium and Related Element: The sample solution should not become turbid when rendered slightly alkaline to litmus paper with 6N ammonium hydroxide.
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