Potassium phosphate monobasic (monopotassium orthophosphate) is a water soluble inorganic salt. Its standard enthalpy of formation has been reported to be -376.1kcalmol-1. It acts a starting material in the synthesis of potassium metaphosphate.
Synonyms: Monopotassium phosphate; Potassium dihydrogen phosphate; prim.-Potassium phosphate
Molecular Formula: H2KO4P
Molecular Weight: 136.09
Linear Structural Formula: KH2PO4
MDL Number: MFCD00011401
Purity: >=99.0%
Melting Point: 252.6 C (lit.)
Density: 2.338 g/mL at 25 C (lit.)
Application: 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 (ATPS).
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Anion Traces: chloride (Cl-): ≤0.001%
Assay: ≥99.0%
Cation Traces: heavy metals (as Pb): ≤0.001%
Density: 2.338 g/mL at 25°C(lit.)
Grade: ACS reagent
Impurities: ≤0.01% Insoluble matter
Loss: ≤0.2% loss on drying, 105°C
MP: 252.6°C(lit.)
pH: 4.1-4.5 (25°C, 5%)
pKa (25°C): (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)