Potassium Nitrate

Potassium Nitrate

BP

REFINED

Description

White or almost white crystalline powder or colorless crystals

White crystalline powder

Identification

It gives reactions of nitrates and of potassium

It gives reactions of nitrates and of potassium

Solubility

Freely soluble in water, very soluble in boiling water, practically insoluble in ethanol (96%)

Highly soluble in water

Appearance of solution

Clear and colorless

Clear and colorless

K2O

-

46.44%

Insoluble matter

-

Max 0.02%

Alkalinity/Acidity

Not more than 0.5 ml of 0.01 m HCl or 0.5 ml of 0.01 M NaOH

Residual Substance

Solution does not become blue within 2 min

Heavy Metals

Max 10 ppm

Max 0.002%

Sodium

Max 0.1%

Chloride

Max 20 ppm (if intended for ophthalmic use)

Max 0.07%

Iron

Max 20 ppm

Ammonia

Max 100 ppm

Sulphate

Max 150 ppm

Max 0.03%

Loss on Drying

Max 0.5%

Calcium & Magnesium

Max 100 ppm (Cal)

Max  0.05%

Nitrogen

-

13.82%

pH

-

6.0 to 8.0

Moisture

-

Max 1.0%

Assay dry basis

99.0% to 101.0%

Min 99.72%