Potassium phosphate monobasic

Name: Potassium phosphate monobasic
Brand: SIAL

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

Synonym(s):

Potassium dihydrogen phosphate, prim.-Potassium phosphate

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About This Item

Linear Formula:

KH₂PO₄

CAS Number:

7778-77-0

Molecular Weight:

136.09

NACRES:

NA.21

PubChem Substance ID:

329768487

UNSPSC Code:

12352302

EC Number:

231-913-4

MDL number:

MFCD00011401

assay:

≥99%

grade:

ACS reagent
anhydrous

form:

powder or crystals

solubility:

water: soluble (208 g/l at 20 °C (68 °F))

Product Name

Potassium phosphate monobasic, anhydrous, free-flowing, Redi-Dri^™, ACS reagent, ≥99%

InChI key

GNSKLFRGEWLPPA-UHFFFAOYSA-M

InChI

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

SMILES string

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

grade

ACS reagent
anhydrous

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.)

solubility

water: soluble (208 g/l at 20 °C (68 °F))

density

2.338 g/mL at 25 °C (lit.)

anion traces

chloride (Cl^-): ≤0.001%
sulfate (SO₄^2-): ≤0.003%

cation traces

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

Quality Level

200

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Related Categories

Lab Chemicals

Phosphates

Salts

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

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!

Legal Information

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

Storage Class

11 - Combustible Solids

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

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How does Redi-Dri^™ help keep salts and buffers free-flowing?
Redi-Dri^™ products are specially handled and the bottle is specially designed to ensure that the product will remain dry without adding impurities or additives to the product. Ensuring that you receive the highest quality material that is easy to handle.
Are there any special storage conditions that must be maintained?
No, Redi-Dri^™ products can be stored under the same conditions as the equivalent non-Redi-Dri^™ products.
How long will material remain free-flowing after it is opened?
While the exact amount of time your material will remain free-flowing can vary, this largely depends on the ambient storage conditions and how many times it is opened.

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