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Potassium Iodide
Pure and USP BP IP ACS Reagent FCC Food Grade
Potassium Iodide

Potassium Iodide: CAS Number: 7681-11-0, Molecular Formula: KI, Molecular Weight: 166

Specifications of Potassium Iodide Commercial Pure:
Appearance
: White Powder
Assay: 99.0% min KI
Insoluble Matter: 0.005% max
Loss on drying: 0.2%  max at 150C
pH of 5% solution: 6.0 TO 9.2 at 25C
Chlorides & Bromides: 0.01% as Cl
Iodate (IO3): 3 ppm max
Phosphate (PO4): 0.001% max
Sulfate (SO4): 0.005% max
Barium (Ba): 0.002% max
Heavy Metals (Pb): 5 PPM max
Iron (Fe): 3 PPM max
Calcium (Ca): 0.002% max
Magnesium (Mg): 0.001% max
Sodium (Na): 0.005% max


Potassium Iodide FCC Food Grade
KI Formula wt 166.00
CAS: [7681-11-0]

DESCRIPTION
Potassium Iodide occurs as hexahedral crystals, either transparent and colorless or somewhat opaque and white, or as a white, granular powder. It is stable in dry air but slightly hygroscopic in moist air. One gram is soluble in 0.7 mL of water at 25°, in 0.5 mL of boiling water, in 2 mL of glycerin, and in 22 mL of alcohol.

REQUIREMENTS
Identification:
A. A 1:10 aqueous solution responds to the tests for Potassium and for Iodide.
B. The pH of a 1:20 aqueous solution is between 6 and 10.
Assay: Not less than 99.0% and not more than 101.5% of KI after drying.
Iodate: Not more than 4 mg/kg.
Lead: Not more than 4 mg/kg.
Loss on Drying: Not more than 1%.
Nitrate, Nitrite, and Ammonia: Passes test.
Thiosulfate and Barium: Passes test.


Potassium Iodide USP
KI -- 166.00
Potassium iodide -- [7681-11-0]

Potassium Iodide contains not less than 99.0 percent and not more than 101.5 percent of KI, calculated on the dried basis.

Identification: A solution of it meets the requirements of the tests for Potassium and for Iodide.
Alkalinity: Dissolve 1.0 g in 10 mL of water, and add 0.1 mL of 0.1 N sulfuric acid and 1 drop of phenolphthalein TS: no color is produced.
Loss on drying: Dry it at 105C for 4 hours: it loses not more than 1.0% of its weight.
Iodate: Dissolve 1.1 g in sufficient ammonia- and carbon dioxide-free water to obtain 10 mL of solution, and transfer to a color-comparison tube. Add 1 mL of starch TS and 0.25 mL of 1.0 N sulfuric acid, mix, and compare the color with that of a control containing, in a similar volume, 100 mg of Potassium Iodide, 1 mL of standard iodate solution [prepare by diluting 1 mL of potassium iodate solution (1 in 2500) with water to 100 mL], 1 mL of starch TS, and 0.25 mL of 1.0 N sulfuric acid. Any color produced in the solution of the test specimen does not exceed that in the control: not more than 4 µg per g is found.
Limit of nitrate, nitrite, and ammonia: To a solution of 1 g in 5 mL of water contained in a test tube of about 40-mL capacity add 5 mL of 1 N sodium hydroxide and about 200 mg of aluminum wire. Insert a pledget of purified cotton in the upper portion of the test tube, and place a piece of moistened red litmus paper over the mouth of the tube. Heat the test tube and its contents in a steam bath for 15 minutes: no blue coloration of the paper is discernible.
Thiosulfate and barium: Dissolve 0.5 g in 10 mL of ammonia- and carbon dioxide-free water, and add 2 drops of 2 N sulfuric acid: no turbidity develops within 1 minute.
Heavy metals: Dissolve 2.0 g in 25 mL of water: the limit is 0.001%.
Assay: Dissolve about 500 mg of Potassium Iodide, accurately weighed, in about 10 mL of water, and add 35 mL of hydrochloric acid. Titrate with 0.05 M potassium iodate VS until the dark brown solution which is produced becomes pale brown. Add 2 to 3 drops of amaranth TS, and continue the titration slowly until the red color just changes to yellow. Each mL of 0.05 M potassium iodate is equivalent to 16.60 mg of KI.


Potassium Iodide BP (Ph Eur monograph 0186)
KI -- 166.0 -- 7681-11-0

Content: 99.0 per cent to 100.5 per cent (dried substance).

CHARACTERS
Appearance: White or almost white powder or colourless crystals.
Solubility: Very soluble in water, freely soluble in glycerol, soluble in ethanol (96 per cent).

IDENTIFICATION
A. Solution S (see Tests) gives the reactions of iodides (2.3.1).
B. Solution S gives the reactions of potassium (2.3.1).

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free water R prepared from distilled water R and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Alkalinity: To 12.5 ml of solution S add 0.1 ml of bromothymol blue solution R1. Not more than 0.5 ml of 0.01 M hydrochloric acid is required to change the colour of the indicator.
Iodates
: To 10 ml of solution S add 0.25 ml of iodide-free starch solution R and 0.2 ml of dilute sulphuric acid R and allow to stand protected from light for 2 min. No blue colour develops.
Sulphates: Maximum 150 ppm.
Dilute 10 ml of solution S to 15 ml with distilled water R.
Thiosulphates
: To 10 ml of solution S add 0.1 ml of starch solution R and 0.1 ml of 0.005 M iodine. A blue colour is produced.
Iron: Maximum 20 ppm.
Dilute 5 ml of solution S to 10 ml with water R.
Heavy metals
: Maximum 10 ppm.
12 ml of solution S complies with test A. Prepare the reference solution using lead standard solution (1 ppm Pb) R.
Loss on drying: Maximum 1.0 per cent, determined on 1.00 g of previously powdered substance by drying in an oven at 105C for 3 h.


POTASSIUM IODIDE IP
KI -- Mol. Wt. 166.00

Category: Antithyroid; antifungal; expectorant.
Description: Colourless crystals or white powder; odourless
Solubility: Very soluble in water; freely soluble in glycerin; soluble in ethanol (95%).

STANDARDS
Potassium Iodide contains not less than 99.0 per cent and not more than 100.5 per cent of KI, calculated with reference to the dried substance.
Identification: A 10% w/v solution in carbon dioxide-free water (solution A) gives the reactions of potassium salts and of iodides.
Alkalinity: To 10 ml of solution A add 0.2 ml of 0.01M sulphuric acid; no colour is produced on addition of a drop of phenolphthalein solution. .
Clarity and colour of solution: Solution A is clear and colourless.
Arsenic: Dissolve 5.0 g in 50 ml of 'water and 12 ml of stannated hydrochloric acid AsT. The resulting solution complies with the limit test for arsenic (2 ppm).
Heavy metals: Not more than 10 ppm, determined on 2.0 g
Iron: Solution A complies with the limit lest for iron (20 ppm).
Barium: Dissolve 0.5 g in 10 ml of water and add 1 ml of dilute sulphuric acid; no turbidity develops within one minute.


Potassium Iodide ACS AR Analytical Reagent Grade Chemical
KI -- Formula Weight 166.00
CAS Number 7681-11-0

REQUIREMENTS
Assay: Minimum 99.0% KI
pH of a 5% solution: 6.0-9.2 at 25C

MAXIMUM ALLOWABLE
Insoluble matter: 0.005%
Loss on drying at 150C: 0.2%
Chloride and bromide (as Cl): 0.01%
Iodate (IO3): 3 ppm
Nitrogen compounds (as N): 0.001%
Phosphate (PO4): 0.001%
Sulfate (SO4): 0.005%
Barium (Ba): 0.002%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 3 ppm
Calcium (Ca): 0.002%
Magnesium (Mg): 0.001%
Sodium (Na): 0.005%

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