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P0662

Sigma-Aldrich

Potassium phosphate monobasic

ACS reagent, ≥99.0%

Potassium phosphate monobasic

Synonym(s):

Potassium dihydrogen phosphate, prim.-Potassium phosphate

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$56.80
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$94.50
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$165.00
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$278.00
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$689.00
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$56.80


Estimated to ship onJuly 11, 2025Details


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25 G
$56.80
500 G
$94.50
1 KG
$165.00
2.5 KG
$278.00
6 X 500 G
$470.00
12 KG
$689.00
4 X 2.5 KG
$1,300.00

About This Item

Linear Formula:
KH2PO4
CAS Number:
Molecular Weight:
136.09
EC Number:
MDL number:
UNSPSC Code:
12352302
PubChem Substance ID:
NACRES:
NA.21
Assay:
≥99.0%
Grade:
ACS reagent
Form:
powder or crystals

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$56.80


Estimated to ship onJuly 11, 2025Details


Request a Bulk Order
Technical Service
Need help? Our team of experienced scientists is here for you.
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grade

ACS reagent

Quality Level

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.)

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
6022060229RDD037
form

powder or crystals

form

crystalline

form

crystalline

form

-

assay

≥99.0%

assay

99.5-100.5%

assay

98-100.5% dry basis

assay

≥99.0%

Quality Level

200

Quality Level

100

Quality Level

200

Quality Level

100

grade

ACS reagent

grade

ACS reagent, anhydrous, puriss. p.a.

grade

anhydrous

grade

-

anion traces

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

anion traces

chloride (Cl-): ≤5 mg/kg, sulfate (SO42-): ≤30 mg/kg

anion traces

-

anion traces

-

pH

4.1-4.5 (25 °C, 5%)

pH

4.2-4.5 (20 °C, 5%)

pH

-

pH

-

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.[1] It acts a starting material in the synthesis of potassium metaphosphate.[2]

Application

Potassium phosphate monobasic has been used in the preparation of phosphate buffer[3] and phosphate buffered saline (PBS).[4][5] It has also been used in the preparation of PEG1000 (poly ethylene glycol)/potassium phosphate aqueous two-phase systems (ATPS).[6]

Legal Information

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

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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Questions

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  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer
    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer
    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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