Potassio diidrogenofosfato, Pharmpur®, Ph Eur, BP, NF

- Synonyms: Potassium biphosphate, Potassium phosphate monobasic, Primary potassium phosphate, Mono-potassium phosphate
- KH2PO4
- M = 136,09 g/mol
- CAS [7778-77-0]
- EINECS-No.: 231-913-4
- Solub. in water: (20 ºC): 222 g/l
- Melting point: ~ 253 ºC (decomposes)
- Tariff number: 2835 24 00 00
- Applications: analytical chemistry; in buffer solutions.

SPECIFICATIONS
assay (acidimetric, on dried sample): 98,0 - 100,5 %
assay (acidimetric, referred to dried sample): 98,0 - 100,5 %
Identification A (EP): passes test
Identification phosphate: passes test
Identification potassium: passes test
appearance of solution (10 %, H2O): clear and colourless
insoluble in water : max. 0,2 %
pH (5 %, H2O): 4,2 - 4,5
chlorides (Cl): max. 200 ppm
sulfates (SO4): max. 300 ppm
arsenic (As): max. 2 ppm
lead (Pb): max. 5 ppm
fluorides (F): max. 10 ppm
iron (Fe): max. 10 ppm
reducing substances: passes test
loss on drying (105 °C, 4h) : max. 1,0 %
loss on drying (130 ºC): max. 2,0 %