31263

Potassium nitrate

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

• 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

Properties

• 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 (PO₄^3-): ≤5 mg/kg; sulfate (SO₄^2-): ≤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

Description

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.

Safety Information

• Pictograms: GHS03
• Signal Word: Warning
• Hazard Statements: H272
• Precautionary Statements: P210 - P220 - P280 - P370 + P378 - P501
• 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