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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

grade

ACS reagent

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. It is also found in toothpastes as a desensitizer for tooth hypersensitivity. The addition of KNO3 to growth medium has shown to promote growth in salt stressed melon plants.

Application

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

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

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

FSL

Group 1: Oxidizing solids
Nitrates
Hazardous rank I
1st oxidizing solid

ISHL Indicated Name

Substances Subject to be Indicated Names

ISHL Notified Names

Substances Subject to be Notified Names

JAN Code

221295-12KG:
221295-500G:
221295-BULK:
221295-VAR:
221295-2.5KG:
221295-100G:
221295-5G:

Certificates of Analysis (COA)

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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)
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)
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)
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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