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Potassium phosphate monobasic

SIGALD/04243 - meets analytical specification of Ph. Eur., NF, E340, anhydrous, 98-100.5% (calc. to the dried substance)

Synonym: Monopotassium phosphate; Potassium dihydrogen phosphate; prim.-Potassium phosphate

CAS Number: 7778-77-0
Empirical Formula (Hill Notation): H2KO4P
Molecular Weight: 136.09
EC Number: 231-913-4
MDL Number: MFCD00011401
Linear Formula: KH2PO4
Product Type: Chemical

Catalog Number PKG Qty. Price Quantity
45-04243-500G 500 g
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45-04243-6X500G 500 g
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45-04243-1KG 1 kg
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45-04243-6X1KG 1 kg
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45-04243-5KG 5 kg
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45-04243-4X5KG 5 kg
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anion traces chloride (Cl-): ≤10 mg/kg
  fluoride (F-): ≤10 mg/kg
  sulfate (SO42-): ≤200 mg/kg
assay 98-100.5% (calc. to the dried substance)
cation traces As: ≤2 mg/kg
  Cd: ≤1 mg/kg
  Cu: ≤20 mg/kg
  Fe: ≤10 mg/kg
  Hg: ≤1 mg/kg
  Na: ≤1000 mg/kg
  Pb: ≤4 mg/kg
  Zn: ≤20 mg/kg
density 2.338 g/mL at 25 °C (lit.)
form crystalline
grade anhydrous
impurities org. volatile impurities, complies (GC)
  residual solvents, complies
  ≤0.001% heavy metals (as Pb)
  ≤0.04% KMnO4 red. matter (as O)
  ≤0.2% in water insoluble matters
InChI 1S/K.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1
loss ≤1% loss on drying, 130 °C
mp 252.6 °C (lit.)
pH 4.2-4.5 (20 °C, 5%)
pKa (25 °C) (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)
quality meets analytical specification of Ph. Eur., NF, E340
Quality Level 200 
SMILES string [K+].OP(O)([O-])=O
solubility alcohol: insoluble
  H2O: soluble 4.5 parts
suitability complies for appearance of solution
Application: Potassium phosphate monobasic was used for separating tobacco protein by using aqueous two-phase extraction.
Biochem/physiol Actions: Potassium phosphate monobasic also referred to as monopotassium phosphate or potassium dihydrogen phosphate is a soluble salt of potassium that serves as a buffering agent. It enhances the solubility of calcium and phosphorus in amino acid plus dextrose solutions and hence assists in improving the mineral balance of parenterally fed low birth weight infants.
Preparation Note: Potassium phosphate monobasic dissolves in 4.5 (approx.) parts of water to yield a solution. It is practically insoluble in alcohol.
RIDADR NONH for all modes of transport
Flash Point(F) Not applicable
Flash Point(C) Not applicable
Purity 98-100.5% (calc. to the dried substance)
mp 252.6 °C (lit.)
Density 2.338 g/mL at 25 °C (lit.)
UNSPSC 12161700

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