Dibasic sodium phosphate dihydrate USP/Ph.Eur/BP 500GM Go Back


: 10028-24-7

Molecular Formula

: Na2HPO4.2H2O

Molecular Weight

: 177.99
Description: White powder or colorless crystals.
Solubility: Freely soluble in water; practically insoluble in ethanol (96%)
Identification (By chemical test): Solution should be slightly alkaline
Identification (By Loss on drying): 19.5%- 21.0%
Identification (Sodium): A dense precipitate should form.
Identification (Phosphate 1): A yellow precipitate that solution in 2N nitric acid and in 6N ammonium hydroxide should form.
Identification (Phosphate 2): With ammonium molybdate solution, acidified solutions should yield a yellow precipitate which 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% (Na2HPO4)
Insoluble Substances: NMT 0.4%
Appearance of solution: Clear and colorless solution
Reducing substances: The color of the permanganate should not completely discharge
Monosodium Phosphate: NMT 2.5%
Chlorides: NMT 400ppm
Sulphate (SO4): NMT 0.1%
Arsenic (As): NMT 4ppm
Iron(Fe): NMT 40ppm
Loss on drying,130°C: 19.5 - 21.0%
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