Potassium phosphate monobasic has been used in the preparation of phosphate buffer and phosphate buffered saline (PBS).
It has also been used in the preparation of PEG1000 (poly ethylene glycol)/potassium phosphate aqueous two-phase systems.
|impurities||≤0.01% Insoluble matter|
|loss||≤0.2% loss on drying, 105°C|
|pH||4.1-4.5 (25 °C, 5%)|
|pKa (25 °C)||(1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)|
|mp||252.6 °C (lit.)|
|density||2.338 g/mL at 25 °C (lit.)|
|anion traces||chloride (Cl–): ≤0.001%|
|sulfate (SO42-): ≤0.003%|
|cation traces||Fe: ≤0.002%|
|heavy metals: ≤0.001% (by ICP-OES)|