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Potassium Nitrate BP USP IP ACS Analytical Reagent FCC Food grade Manufacturers
Potassium Nitrate CAS Number 7757-79-1, EINECS EC Number 231-818-8, HS Code 283421**, Molecular Weight 101.1, Chemical Formula: KNO3
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Potassium Nitrate Nitrite Commercial Specifications
For MSDS Sheet Click MSDS of Potassium Nitrate BP USP IP ACS FCC Food Grade Manufacturers
Potassium Nitrate BP
KNO3 -- 101.1 -- 7757-79-1
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.
A white, crystalline powder or colourless crystals, freely soluble in water, very soluble in boiling water, practically insoluble in alcohol.
A. It gives the reaction of nitrates.
B. Solution S (see Tests) gives the reactions of potassium.
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.
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.
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).
Dilute 10 ml of solution S to 15 ml with distilled water. The solution complies with the limit test for sulphates (150 ppm).
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.
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.
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.
Not more than 0.1 per cent of Na, determined by atomic emission spectrometry.
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
Potassium nitrate [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 FCC Food Grade
KNO3 Formula wt 101.10
INS: 252 CAS: [7757-79-1]
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.
Function: Antimicrobial agent; preservative.
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%.
American Chemical Society
Potassium Nitrate ACS Analytical Reagent
Formula Wt 101.10
CAS Number 7757-79-1
Assay: 99.0% KNO3
pH of a 5% solution: 4.5-8.5 at 25C
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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Last 23 March, 2017
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