Potassium nitrate

InChI key

FGIUAXJPYTZDNR-UHFFFAOYSA-N

InChI

1S/K.NO3/c;2-1(3)4/q+1;-1

SMILES string

[K+].[O-][N+]([O-])=O

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

suitability

complies for appearance of solution

Quality Level

100