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Sigma-Aldrich

Potassium phosphate monobasic

tested according to Ph. Eur., anhydrous

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Synonym(s):
Kalii dihydrogenophosphas, Monopotassium phosphate, Potassium dihydrogen phosphate, prim.-Potassium phosphate
Linear Formula:
KH2PO4
CAS Number:
Molecular Weight:
136.09
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.25

grade

anhydrous

Quality Level

Agency

USP/NF
tested according to Ph. Eur.

Assay

98-100.5% dry basis

form

crystalline

loss

<2.0% loss on drying

pKa (25 °C)

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

mp

252.6 °C (lit.)

solubility

water: 208 g/L at 20 °C

density

2.338 g/mL at 25 °C (lit.)

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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This Item
RDD02057618229806
agency

USP/NF, tested according to Ph. Eur.

agency

-

agency

-

agency

-

assay

98-100.5% dry basis

assay

≥99.0% (titration)

assay

99.5-101.0% (T)

assay

99.99% trace metals basis

form

crystalline

form

crystalline

form

solid

form

solid

mp

252.6 °C (lit.)

mp

252.6 °C (lit.)

mp

252.6 °C (lit.)

mp

252.6 °C (lit.)

solubility

water: 208 g/L at 20 °C

solubility

water: 100 mg/mL, clear, colorless

solubility

H2O: 10%, clear, colorless

solubility

-

General description

Potassium phosphate monobasic (KH2PO4), also known as monopotassium phosphate(MKP), is a soluble salt. It serves as a source of phosphorus and potassium. KH2PO4 is an essential component of potassium phosphate buffer, which is utilized in aqueous two-phase systems (ATPS) that are often used in the purification of lipases.

Application

Potassium phosphate monobasic buffer has been used as a component of the mobile phase in high-performance liquid chromatography (HPLC).

Biochem/physiol Actions

Potassium phosphate monobasic (MKP) is a commonly used buffering agent in biochemical and biological applications. It is used as a component of the buffer system in electrophoresis for the separation of biomolecules.

Features and Benefits

Assured high quality as it is tested according to both USP/NF and Ph. Eur. standards

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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