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P0662

Potassium phosphate monobasic

Name: Potassium phosphate monobasic
Brand: SIGALD

ACS reagent, ≥99.0%

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:

329820048

UNSPSC Code:

12352302

EC Number:

231-913-4

MDL number:

MFCD00011401

Assay:

≥99.0%

Grade:

ACS reagent

Form:

powder or crystals

Solubility:

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

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Properties

grade

ACS reagent

Quality Level

200

agency

suitable for EPA 300, suitable for SM 5210

assay

≥99.0%

form

powder or crystals

technique(s)

tissue culture: suitable

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)

bp

>450 °C

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)

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

Description

General description

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

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

Other Notes

Go to Redi-Dri^™ Product Listing 795488

Legal Information

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

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Storage Class

13 - Non Combustible Solids

flash_point_f

Not applicable

flash_point_c

Not applicable

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Standard enthalpies of formation of monopotassium and dipotassium orthophosphate.

Luff BB and Reed RB.

Journal of Chemical and Engineering Data, 23(1), 60-62 (1978)

Estimation of Wound Tissue Neutrophil and Macrophage Accumulation by Measuring Myeloperoxidase (MPO) and N-Acetyl-?-D-glucosaminidase (NAG) Activities.

Cassini-Vieira P, et al.