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221295

Sigma-Aldrich

Potassium nitrate

ACS reagent, ≥99.0%

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About This Item

Empirical Formula (Hill Notation):
KNO3
CAS Number:
7757-79-1
Molecular Weight:
101.10
EC Number:
231-818-8
MDL number:
MFCD00011409
UNSPSC Code:
12352302
PubChem Substance ID:
329752256
NACRES:
NA.21
Assay:
≥99.0%
grade:
ACS reagent
form:
crystals
Pricing and availability is not currently available.

grade

ACS reagent

Quality Level

200

Assay

≥99.0%

form

crystals

impurities

≤0.005% insolubles

pH

4.5-8.5 (25 °C, 5%)

mp

334 °C (lit.)

anion traces

chloride (Cl-): ≤0.002%
iodate (IO3-): ≤5 ppm
nitrite (NO2-): ≤0.001
phosphate (PO43-): ≤5 ppm
sulfate (SO42-): ≤0.003%

cation traces

Ca: ≤0.005%
Fe: ≤3 ppm
Mg: ≤0.002%
Na: ≤0.005%
heavy metals: ≤5 ppm (by ICP-OES)

SMILES string

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

InChI

1S/K.NO3/c;2-1(3)4/q+1;-1

InChI key

FGIUAXJPYTZDNR-UHFFFAOYSA-N

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General description

Potassium nitrate is a water-soluble inorganic salt that is commonly used as nitrogen fertilizer.[1] It is also found in toothpastes[2] as a desensitizer for tooth hypersensitivity.[3] The addition of KNO3 to growth medium has shown to promote growth in salt stressed melon plants.[4]

Application

Potassium nitrate may be used in the synthesis of 5-bromo-8-nitroisoquinoline via bromination of isoquinoline using N-bromosuccinimide.[5]

Pictograms

Flame over circle
GHS03

Signal Word

Warning

Hazard Statements

H272

Hazard Classifications

Ox. Sol. 3

Storage Class Code

5.1B - Oxidizing hazardous materials

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
0000419199
0000419172
0000419172
0000419199
MKCW9539

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Response of vesicular-arbuscular endomycorrhizal sweetgum seedlings to three nitrogen fertilizers.
Brown RW, et al.
Forest Science, 27(2), 413-420 (1981)
Improved salt tolerance of melon (Cucumis melo L.) by the addition of proline and potassium nitrate.
Kaya C, et al.
Environmental and Experimental Botany, 60(3), 397-403 (2007)
Potassium nitrate toothpaste for dentine hypersensitivity
Poulsen S, et al.
Cochrane database of systematic reviews (Online), 2, D001476-D001476 (2001)
Synthesis of 5-Bromoisoquinoline and 5-Bromo-8-nitroisoquinoline.
Organic Syntheses, 98-104 (2005)
A superior desensitizer--potassium nitrate.
M Hodosh
Journal of the American Dental Association (1939), 88(4), 831-832 (1974-04-01)
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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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