Potassium phosphate monobasic

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

Synonym(s):Monopotassium phosphate, Potassium dihydrogen phosphate, prim.-Potassium phosphate

Properties

grade

anhydrous

Quality Level

200

assay

98-100.5% (calc. to the dried substance)

form

crystalline

quality

meets analytical specification of Ph. Eur., NF, E340

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

loss

?1% loss on drying, 130 ?C

pH

4.2-4.5 (20??C, 5%)

pKa (25??C)

(1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)

mp

252.6??C (lit.)

solubility

H₂O: soluble 4.5?parts
alcohol: insoluble

density

2.338?g/mL?at 25??C (lit.)

anion traces

chloride (Cl^–): ?10?mg/kg
fluoride (F^–): ?10?mg/kg
sulfate (SO₄^2-): ?200?mg/kg

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

suitability

complies for appearance of solution

SMILES string

[K+].OP(O)([O-])=O

InChI

1S/K.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1

InChI key

GNSKLFRGEWLPPA-UHFFFAOYSA-M

Safety Information

Storage Class Code

13 – Non Combustible Solids

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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