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12648

Sigma-Aldrich

Potassium nitrate

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

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

Quality Level

grade

puriss.

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

Signal Word

Warning

Hazard Statements

Precautionary Statements

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

Certificate of Analysis

Certificate of Origin

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
Changhong Yao et al.
Bioresource technology, 118, 438-444 (2012-06-22)
Microalgal starch is a potential feedstock for biofuel production. The effects of KNO(3) and MgSO(4) concentrations and light intensity on biomass and starch production by the marine microalga, Tetraselmis subcordiformis, were investigated. Under 200 μmol m(-2) s(-1) irradiance and sulfur-deprived
Jing Huang et al.
Applied and environmental microbiology, 80(1), 29-42 (2013-10-01)
Bacteria play important roles in mineral weathering and soil formation. However, few reports of mineral weathering bacteria inhabiting subsurfaces of soil profiles have been published, raising the question of whether the subsurface weathering bacteria are fundamentally distinct from those in

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