12648

Potassium nitrate

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

• 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: 329749787
• NACRES: NA.21
• assay: 99.0-100.5%
• form: powder or crystals

Properties

• 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 (SO₄^2-): ≤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

Description

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.[1]

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.[2]
• As phase change material for the preparation of nanofluids with phase change behavior.[3]

Safety Information

• pictograms: GHS03
• signalword: Warning
• hcodes: H272
• pcodes: P210 - P220 - P280 - P370 + P378 - P501
• 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