Monobasic potassium phosphate USP-NF/Ph.Eur/BP PARENTEX PLUS 500GM Go Back


: 7778-77-0

Molecular Formula

: KH2PO4

Molecular Weight

: 136.09
Appearance: White or almost white, odourless crystals, granular or crystalline or colourless powder. Is odorless and is stable in air. The pH of a solution (1 in 100) is about 4.5.
Solubility: Freely soluble in water, practically insoluble in ethanol (96%)
Identification A (By Chemical test): Solution should be faintly acid
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 (Potassium 1): White crystalline precipitate should form.
Identification (Potassium 2): A yellow or orange-yellow precipitate should form immediately.
Identification (Phosphate 2): With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide
Appearance of solution: Clear and colorless solution
pH: 4.2 to 4.5
Reducing substances: The color of the permanganate should not be completely discharged
Chlorides: NMT 200 ppm
Sulfates: NMT 300 ppm
Arsenic: NMT 2 ppm
Iron: NMT 10 ppm
Lead: NMT 5 µg/gm
Fluoride(F): NMT 10 µg/gm
Insoluble Substances: NMT 20 mg (0.2%)
Loss on drying: NMT 1.0%
Assay (on dried basis): 98.0% to 100.5%
Sodium (Na): NMT 0.1%
Total aerobic microbial count: NMT 100 CFU/gm
Total combined yeast and mold count: NMT 10 CFU/gm
E.coli: should be absent/gm
Salmonella: should be absent/10 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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