Dibasic Sodium Phosphate Heptahydrate USP PARENTEX PLUS 1KG Go Back


: 7782-85-6

Molecular Formula

: Na2HPO4.7H2O

Molecular Weight

: 268.07
Description: Colorless or white, granular or caked salt. Effloresces in warm, dry air. Its solutions are alkaline to phenolphthalein. A 0.1M solution should have a pH about 9.
Solubility: Freely soluble in water; very slightly soluble in alcohol
Identification A (By Chemical test): A dense precipitate should form.
Identification B (By Chemical test 1): With silver nitrate solution neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide.
Identification B (By Chemical test 2): With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide.
Assay (on dried basis): 98.0% - 100.5% (Na2HPO4)
Insoluble Substances: NMT 0.4%
Chlorides: NMT 0.06%
Sulfate (SO4): NMT 0.2%
Arsenic (As): NMT 1.5ppm
Loss on drying,130°C: 43.0% - 50.0%
Total aerobic microbial count: NMT 100 CFU/gm
Total Yeast & mold count: NMT 10 CFU/gm
Escherichia coli: should be absent/gm
Salmonella: should be absent/ 10gm
Pseud. aeruginosa: should be absent/gm
Staphylococcus aureus: should be absent/gm
Bile-tolerant gram negative bacteria: should be absent/gm
Bacterial endotoxins: NMT 2.5 EU/mg
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