Disodium hydrogen phosphate anhydrous USP/Ph.Eur 25KG Go Back


: 7558-79-4

Molecular Formula

: Na2HPO4

Molecular Weight

: 141.96
Appearance/Description: White powder that readily absorbs moisture.
Solubility: Freely soluble in water; insoluble in alcohol
Identification (By chemical test): Solution should slightly alkaline.
Identification (By Loss on drying): Not more than 1.0%
Identification (Sodium): A dense precipitate should form.
Identification (Phosphate 1): With silver nitrate solution neutral solution should yield yellow precipitate 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 that should soluble in 6N ammonium hydroxide.
Identification (Phosphate 3): A yellow colour should develop
Assay (on dry basis): 98.0% - 100.5%
Assay (Dried substance): 98.0% - 101.0%
Monosodium Phosphate: NMT 2.5%
Insoluble Substances: NMT 0.4%
Appearance of solution: Solution should be clear and colourless.
Chlorides: NMT 200ppm
Sulphate (SO4): NMT 500ppm
Arsenic (As): NMT 16 ppm
Reducing substances: The colour of the permanganate should not be completely discharge
Iron(Fe): NMT 20ppm
Loss on drying at 130°C: NMT 1.0%
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