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12648

Sigma-Aldrich

Potassium nitrate

puriss., meets analytical specification of Ph Eur, BP, USP, FCC, E252, 99.0-100.5%

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Empirical Formula (Hill Notation):
KNO3
CAS Number:
7757-79-1
Molecular Weight:
101.10
EC Number:
231-818-8
MDL number:
MFCD00011409
UNSPSC Code:
12352300
PubChem Substance ID:
329749787
NACRES:
NA.21

grade

puriss.

Quality Level

100

Assay

99.0-100.5%

form

powder or crystals

quality

meets analytical specification of Ph Eur, BP, USP, FCC, E252

impurities

acidity or alkalinity, complies
 reducing matter, complies
 residual solvents, complies
≤0.001% heavy metals (as Pb)
≤0.005% ammonium (NH4)

loss

≤0.5% loss on drying, 105 °C

pH

5-8 (20 °C, 5%)

mp

334 °C (lit.)

anion traces

chloride (Cl-): ≤10 mg/kg
nitrite (NO2-): ≤5 mg/kg
sulfate (SO42-): ≤100 mg/kg

cation traces

As: ≤1 mg/kg
Ca: ≤50 mg/kg
Cu: ≤10 mg/kg
Fe: ≤10 mg/kg
Na: ≤1000 mg/kg
Pb: ≤4 mg/kg
Zn: ≤10 mg/kg

suitability

complies for appearance of solution

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 colorless potassium salt having rhombic crystals. It is an oxidizing agent. In nature it is found as saltpeter. It can be prepared by reacting potassium carbonate/ hydroxide with nitric acid or by the reaction of sodium nitrate with potassium chloride.1 It can be prepared by combining ammonium nitrate and potassium hydroxide under hot conditions.
Potassium nitrate can find applications as an oxidizer, which can be prepared by combining ammonium nitrate and potassium hydroxide under hot conditions.

Application

Potassium nitrate may be employed for the following studies:
  • Preparation of gun powder, ceramics, glass, dyeing and printing.1
  • As oxidizing agent in the fireworks.1
  • Preparation of potassium nitrite.1
  • As desensitizing agent for tooth hypersensitivity.
  • As phase change material for the preparation of nanofluids with phase change behavior.

Pictograms

Flame over circle
GHS03

Signal Word

Warning

Hazard Statements

H272

Hazard Classifications

Ox. Sol. 3

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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Kosanke.L.K, et al. et al.
Encyclopedic Dictionary of Pyrotechnics: (and Related Subjects) (2012)
A superior desensitizer--potassium nitrate.
M Hodosh
Journal of the American Dental Association (1939), 88(4), 831-832 (1974-04-01)
Rose A Devasia et al.
The Journal of antimicrobial chemotherapy, 63(6), 1173-1178 (2009-03-31)
The aim of this study was to assess the sensitivity, specificity and time to results of mycobacterial growth indicator tube (MGIT) 960, microscopic observation drug susceptibility (MODS) assay and nitrate reductase assay (NRA) compared with the gold standard agar proportion
Wolfgang R Engelsberger et al.
The Plant journal : for cell and molecular biology, 69(6), 978-995 (2011-11-09)
Nitrogen is an essential macronutrient for plant growth and development. Inorganic nitrogen and its assimilation products control various metabolic, physiological and developmental processes. Although the transcriptional responses induced by nitrogen have been extensively studied in the past, our work here
Mila Ivanova Luleva et al.
Sensors (Basel, Switzerland), 11(4), 4188-4206 (2011-12-14)
Displacement of soil particles caused by erosion influences soil condition and fertility. To date, the cesium 137 isotope ((137)Cs) technique is most commonly used for soil particle tracing. However when large areas are considered, the expensive soil sampling and analysis
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