MilliporeSigma
All Photos(2)

1.04873

Supelco

Potassium dihydrogen phosphate

for analysis EMSURE® ISO

Synonym(s):
Potassium phosphate monobasic, mono-Potassium orthophosphate, Potassium biphosphate, Potassium phosphate monobasic, Monopotassium phosphate, Potassium dihydrogen phosphate, prim.-Potassium phosphate
Linear Formula:
KH2PO4
CAS Number:
Molecular Weight:
136.09
MDL number:
EC Index Number:
231-913-4

Agency

reag. ISO

Quality Level

product line

EMSURE®

assay

≥99.5% dry basis (alkalimetric)
99.5-100.5% (alkalimetric)

form

solid

potency

>4640 mg/kg LD50, skin (Rabbit)

technique(s)

UV/Vis spectroscopy: suitable

loss

≤0.2% loss on drying, 110 °C
≤0.2% loss on drying, 130 °C

pH

4.2-4.6 (20 °C, 20 g/L in H2O)

mp

252.6 °C (lit.)

solubility

208 g/L

density

2.338 g/mL at 25 °C (lit.)

bulk density

1200 kg/m3

anion traces

chloride (Cl-): ≤0.0005%
sulfate (SO42-): ≤0.003%

cation traces

As: ≤0.0002%
Cu: ≤0.0003%
Fe: ≤0.0010%
N: ≤0.001%
Na: ≤0.02%
Pb: ≤0.001%
heavy metals (as Pb): ≤0.0010%

storage temp.

2-30°C

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

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Analysis Note

Assay (alkalimetric, calculated on dried substance): 99.5 - 100.5 %
Assay (alkalimetric; dried substance): ≥ 99.5 %
pH-value (5 %; water): 4.2 - 4.5
Chloride (Cl): ≤ 0.0005 %
Sulfate (SO₄): ≤ 0.003 %
Total nitrogen (N): ≤ 0.001 %
Heavy metals (as Pb): ≤ 0.0010 %
As (Arsenic): ≤ 0.0002 %
Cu (Copper): ≤ 0.0003 %
Fe (Iron): ≤ 0.0010 %
Na (Sodium): ≤ 0.02 %
Pb (Lead): ≤ 0.001 %
Reducing substances: passes test
Loss on drying (110 °C): ≤ 0.2 %
Loss on drying (130 °C): ≤ 0.2 %
Correspons to ISO

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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