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Sigma-Aldrich

Potassium nitrate

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

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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:
329753710
NACRES:
NB.24

grade

ACS reagent
puriss. p.a.

Agency

USP/NF
reag. ISO
reag. Ph. Eur.

Assay

≥99%

form

crystalline

impurities

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

pH

5.5-7.5 (20 °C, 5%)

mp

334 °C (lit.)

anion traces

chloride (Cl-): ≤10 mg/kg
iodate (IO3-): ≤5 mg/kg
nitrite (NO2-): ≤10 mg/kg
phosphate (PO43-): ≤5 mg/kg
sulfate (SO42-): ≤20 mg/kg

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)

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 (KNO3) is a water-soluble inorganic salt that is commonly used as a source of nitrate ions. It is also used as a cocatalyst in various organic transformations.

Application

Potassium nitrate can be used in the following:      
  • KNO3/Al2O3 is used as a base heterogeneous catalyst in the production of biodiesel via transesterification reaction. 
  • KNO3/Br2 catalytic system is used for the aerobic oxidations of sulfides and alcohols.

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

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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