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

CASR

: 10028-24-7

Molecular Formula

: Na2HPO4.2H2O

Molecular Weight

: 177.99
Specifications  
Description: White powder that readily absorbs moisture.
Solubility: Freely soluble in water; insoluble in alcohol.
Identification A (By Chemical test): Gives positive test of sodium.
Identification B (By Chemical test): Gives positive test of Phosphate.
Assay (Dried substance): 98.0% - 100.5% (Na2HPO4)
Insoluble Substances: NMT 20mg (NMT 0.4%)
Chlorides: 0.06% max
Sulphate (SO4): 0.2% max
Arsenic (As): 16ppm max
Heavy metals: 20ppm max
Loss on drying,130°C: 18.5% - 21.5%
Appearance: A white or almost white powder or colourless crystals.
Solubility: Soluble in water, practically insoluble in ethanol (96%).
Identification A (By Chemical test): Solution S slightly alkaline.
Identification B (By Loss on drying): 19.5% - 21.0%
Identification C (By Chemical test): Solution S gives reaction (b) of phosphates.
Identification D (By Chemical test): Solution S gives reaction (a) of sodium.
Appearance of Solution: Solution S is clear and colourless.
Reducing substances: The colour of the permanganate is not completely discharged.
Monosodium Phosphate: max 2.5%
Chlorides: 400ppm max
Sulphate (SO4): 0.1% max
Arsenic (As): 4ppm max
Iron (Fe): 40ppm max
Loss on drying,130°C: 19.5 - 21.0%
Assay (Dried substance): 98.0% - 101.0%
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