Monobasic sodium phosphate anhydrous USP/BP PARENTEX PLUS 500GM Go Back


: 7558-80-7

Molecular Formula

: NaH2PO4

Molecular Weight

: 119.98
Description: Colorless crystals or white, crystalline powder. Is odorless and is slightly deliquescent. Its solutions are acid to litmus and effervesce with sodium carbonate.
Solubility: Freely soluble in water; practically insoluble in alcohol.
Identification A (Sodium): A dense precipitate should form.
Identification B (Phosphate 1): A neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide
Identification B (Phosphate 2): With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide.
Identification (By chemical test 1): Solution should be slightly acid
Identification (By Loss on drying): NMT 1.0%
Assay (Anhydrous basis): 98.0% - 103.0%
Assay (Dried substance): 98.0%-100.5%
Insoluble Substances: NMT 0.2%
Chlorides: NMT 0.014%
Sulfate (SO4): NMT 0.15%
Aluminium, Calcium and Related Element: The sample solution should not become turbid when rendered slightly alkaline to litmus paper with 6N ammonium hydroxide.
Arsenic (As): NMT 2 ppm
Iron (Fe): NMT 10 ppm
Acidity: pH of the solution should be 4.2-4.5
pH: 4.1 -4.5
Clarity and colour of solution: Clear and colorless solution
Water: NMT 2.0%
Loss on drying at 130°C: NMT 1.0%
Reducing substances: The solution should retain slight red color
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/10 gm
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/gm
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