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Potassium Nitrate
Commercial Pure BP USP ACS Reagent FCC Food Grade
Potassium Nitrate

Potassium Nitrate: CAS Number: 7757-79-1, Molecular Formula: KNO3, Molecular Weight: 101.1

Potassium Nitrate FCC Food Grade
KNO3 Formula wt 101.10
INS: 252 CAS: [7757-79-1]

DESCRIPTION
Potassium Nitrate occurs as colorless, transparent prisms, as white granules, or as a white, crystalline powder. It is slightly hygroscopic in moist air. One gram dissolves in 3 mL of water at 25°, in 0.5 mL of boiling water, and in about 620 mL of alcohol. Its solutions are neutral to litmus.

REQUIREMENTS
Identification: A 1:10 aqueous solution gives positive tests for Potassium and Nitrate.
Assay: Not less than 99.0% and not more than 100.5% of KNO3 after drying.
Chlorate: Sprinkle about 100 mg of dry sample on 1 mL of sulfuric acid. The mixture does not turn yellow.
Lead: Not more than 4 mg/kg.
Loss on Drying: Not more than 1%.


Potassium Nitrate BP
KNO3 -- 101.1 -- 7757-79-1

DEFINITION
Potassium nitrate contains not less than 99.0 per cent and not more than the equivalent of 101.0 per cent of KNO3, calculated with reference to the dried substance.

CHARACTERS
A white, crystalline powder or colourless crystals, freely soluble in water, very soluble in boiling water, practically insoluble in alcohol.

IDENTIFICATION
A. It gives the reaction of nitrates.
B. Solution S (see Tests) gives the reactions of potassium.

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Acidity or alkalinity: To 10 ml of solution S add 0.05 ml of bromothymol blue solution. Not more than 0.5 ml of 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the colour of the indicator.
Reducible substances: To 10 ml of solution S, add 0.5 ml of dilute sulphuric acid and 2 ml of zinc iodide  and starch solution. The solution does not become blue within 2 min.
Chlorides: If intended for ophthalmic use, it complies with the test for chlorides. Dissolve 2.5 g in water and dilute to 15 ml with the same solvent. The solution complies with the limit test for chlorides (20 ppm).
Sulphates: Dilute 10 ml of solution S to 15 ml with distilled water. The solution complies with the limit test for sulphates (150 ppm).
Ammonium: 1 ml of solution S complies with the limit test (A) for ammonium (100 ppm). If intended for ophthalmic use, not more than 50 ppm of ammonium.
Calcium: Dilute 10 ml of solution S to 15 ml with distilled water. The solution complies with the limit test for calcium (100 ppm). If intended for ophthalmic use, not more than 50 ppm of calcium.
Iron
Dilute 5 ml of solution S to 10 ml with water. The solution complies with the limit test for iron (20 ppm). If intended for ophthalmic use, not more than 10 ppm of iron.
Sodium: Not more than 0.1 per cent of Na, determined by atomic emission spectrometry.
Heavy metals: 12 ml of solution S complies with limit test A for heavy metals (10 ppm).
Loss on drying: Not more than 0.5 per cent determined on 1.000 g by drying in an oven at 100°C to 105°C.


Potassium Nitrate USP
KNO3 101.10 --- [7757-79-1].

Potassium Nitrate contains not less than 99.0 percent and not more than 100.5 percent of KNO3.

Identification: A solution of it responds to the tests for Potassium and for Nitrate.
Chloride: A 500-mg portion of it shows no more chloride than corresponds to 0.21 mL of 0.020 N hydrochloric acid (0.03%).
Sulfate: Dissolve 100 mg of Potassium Nitrate in 10 mL of water, add 15 mL of 6 N hydrochloric acid, and evaporate to dryness on a steam bath. To the residue so obtained add 7 mL of 6 N hydrochloric acid, and evaporate to dryness on a steam bath. Dissolve the residue so obtained in about 35 mL of water and, if necessary, neutralize with hydrochloric acid using litmus paper indicator. Filter, if necessary, to obtain a clear test solution. This test solution shows no more sulfate than corresponds to 0.10 mL of 0.020 N sulfuric acid (0.1%).
Arsenic: 3 ppm.
Lead: A solution of 0.5 g of it in 20 mL of water contains not more than 5 4g of lead (corresponding to not more than 0.001% of Pb).
Heavy metals: 0.002%.
Iron: not more than 0.001%.
Limit of sodium: the limit is 0.1%.
Limit of nitrite: To pass the test.


Potassium Nitrate ACS Analytical Reagent
KNO3
Formula Wt 101.10
CAS Number 7757-79-1

REQUIREMENTS
Assay: 99.0% KNO3
pH of a 5% solution: 4.5-8.5 at 25C

MAXIMUM ALLOWABLE
Insoluble matter: 0.005%
Chloride (Cl): 0.002%
Iodate (IO3): 5 ppm
Nitrite (NO2): 0.001%
Phosphate (PO4): 5 ppm
Sulfate (SO4): 0.003%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 3 ppm
Calcium (Ca): 0.005%
Magnesium (Mg): 0.002%
Sodium (Na): 0.005%

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Copyright Last 7 December, 2017

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