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Potassium phosphate monobasic

anhydrous, free-flowing, Redi-Dri, ACS reagent, ≥99%

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

grade

ACS reagent
anhydrous

Quality Level

product line

Redi-Dri

Assay

≥99%

form

powder or crystals

quality

free-flowing

impurities

≤0.01% Insoluble matter

loss

≤0.2% loss on drying, 105°C

pH

4.1-4.5 (25 °C, 5%)

pKa (25 °C)

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

mp

252.6 °C (lit.)

density

2.338 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤0.001%
sulfate (SO42-): ≤0.003%

cation traces

Fe: ≤0.002%
Na: ≤0.005%
heavy metals: ≤0.001% (by ICP)

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
P0662229806P5655
assay

≥99%

assay

≥99.0%

assay

99.99% trace metals basis

assay

≥99.0%

form

powder or crystals

form

powder or crystals

form

solid

form

powder

impurities

≤0.01% Insoluble matter

impurities

≤0.01% Insoluble matter

impurities

≤150.0 ppm Trace Metal Analysis

impurities

-

pH

4.1-4.5 (25 °C, 5%)

pH

4.1-4.5 (25 °C, 5%)

pH

-

pH

4.2-4.6 (20 °C, 20 g/L)

mp

252.6 °C (lit.)

mp

252.6 °C (lit.)

mp

252.6 °C (lit.)

mp

252.6 °C (lit.)

General description

Potassium phosphate monobasic (monopotassium orthophosphate) is a water soluble inorganic salt. Its standard enthalpy of formation has been reported to be −376.1 kcalmol-1. It acts a starting material in the synthesis of potassium metaphosphate.

Redi-Dri technology eliminates clumping and the need for complicated procedures to keep your salts free-flowing. Keeping your salts dry helps improve your results by giving accurate measurements and easier-to-handle salts and buffers. Rather than drying your salts in an oven or desiccator or breaking them apart manually, Redi-Dri ensures that your salts will remain easy-to-use for months without worrying about anti-caking agents. Even after repeated openings you can be assured that your results are always accurate. Redi-Dri saves you time, energy and money by keeping your salts usable for longer!

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 (polyethylene glycol)/potassium phosphate aqueous two-phase systems (ATPS).

Features and Benefits

  • Increased efficiency – Eliminate time and effort of loosening hardened powders
  • Safety – Avoid risks of using tools of force to break up clumps
  • Economy – Faster preparation and solvation increase productivity and reduce costs
  • Assured quality – Excellent, expert-tested quality with no anti-caking agents
  • Flexible volumes – Available from research amounts to scale-up quantities

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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