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221295

Sigma-Aldrich

Potassium nitrate

ACS reagent, ≥99.0%

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Empirical Formula (Hill Notation):
KNO3
CAS Number:
Molecular Weight:
101.10
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent

Quality Level

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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1 of 4

This Item
31263P83941.05061
Potassium nitrate ACS reagent, ≥99.0%

221295

Potassium nitrate

-
Potassium nitrate puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99%

31263

Potassium nitrate

Essential Grade
Potassium nitrate ReagentPlus®, ≥99.0%

P8394

Potassium nitrate

-
Potassium nitrate EMPROVE® ESSENTIAL, Ph. Eur., BP, USP, FCC, E 252

1.05061

Potassium nitrate

-
assay

≥99.0%

assay

≥99%

assay

≥99.0%

assay

-

grade

ACS reagent

grade

ACS reagent, puriss. p.a.

grade

-

grade

-

impurities

≤0.005% insolubles

impurities

≤0.001% ammonium (NH4), ≤0.005% water insolubles

impurities

-

impurities

-

pH

4.5-8.5 (25 °C, 5%)

pH

5.5-7.5 (20 °C, 5%)

pH

7

pH

5.0-7.5 (20 °C, 50 g/L in H2O)

cation traces

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

cation traces

Ca: ≤10 mg/kg, Cu: ≤5 mg/kg, Fe: ≤2 mg/kg, Mg: ≤20 mg/kg, Na: ≤50 mg/kg, Pb: ≤5 mg/kg, Zn: ≤5 mg/kg, heavy metals: ≤5 ppm (by ICP-OES)

cation traces

-

cation traces

-

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

signalword

Warning

hcodes

Hazard Classifications

Ox. Sol. 3

Storage Class

5.1B - Oxidizing hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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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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