Sodium dihydrogen phosphate monohydrate, Pharmpur®, BP, USP

- Synonyms: Sodium biphosphate, Monosodium orthophosphate, Primary sodium phosphate, Sodium phosphate monobasic
- NaH2PO4·H2O
- M = 137,99 g/mol
- CAS [10049-21-5]
- EINECS-No.: 231-449-2
- Solub. in water: (20 ºC): 850 g/l
- Melting point: ~ 100 ºC (decomposes)
- LD 50 (oral, rat): 8290 mg/kg (anhydrous substance)
- Tariff number: 2835 22 00 00
- Applications: analytical chemistry, laboratory reagent, synthesis of organic products, for pharmaceutical use, for softening water, in food industry (E 339).

SPECIFICATIONS
assay (acidimetric, referred to dried sample): 98,0 - 100,5 %
Identification sodium: passes test
Identification phosphate: passes test
appearance of solution: clear and colourless
insoluble in water: max. 0,2 %
acidity: passes test
pH (5 %, H2O): 4,1 - 4,5
chlorides (Cl): max. 0,014 %
sulfates (SO4): max. 300 ppm
aluminium,calcium and related elements: passes test
arsenic (As): max. 2 ppm
iron (Fe): max. 10 ppm
reducing substances: passes test
water content: 10,0 - 15 %
loss on drying (130 ºC): 11,5 - 14,5 %