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Potassium Bromide USP
CAS Number 7758-02-3
Potassium Bromide contains not less than 98.0 percent and not more than 100.5 percent of KBr, calculated on the dried basis. It contains no added substances.
Appearance of solution: clear and colorless.
Test solution: Dissolve 10.0 g in carbon dioxide-free water, and dilute with the same solvent to 100 mL.
A: A solution containing 4.5 mg of potassium bromide responds to the test for Bromide.
B: Responds to the test for Potassium.
Acidity or alkalinity: To 10 mL of the solution prepared for the test for Appearance of solution, add 0.1 mL of bromothymol blue TS: not more than 0.5 mL of 0.01 N hydrochloric acid or 0.01 N sodium hydroxide is required to change the color of this solution.
Loss on drying: Dry it at 100 to 105 for 3 hours: it loses not more than 1.0% of its weight.
Starch–mercuric iodide solution: Triturate 1.0 g of soluble starch with 5 mL of water and pour the mixture into 100 mL of boiling water, containing 10 mg of mercuric iodide.
Procedure: To 10 mL of the solution prepared for the test for Appearance of solution add 1 mL of Starch–mercuric iodide solution, 0.1 mL of a 100 g per L solution of potassium iodide, and 0.25 mL of 0.5 M sulfuric acid. Allow to stand protected from light for 5 minutes: no blue or violet color develops.
Limit of chlorine: not more than 0.6%.
Iodides: To 5 mL of the solution prepared for the test for Appearance of solution add 0.15 mL of a 10.5 g per 100 mL ferric chloride solution, and 2 mL of dichloromethane. Shake, and allow to separate. The lower layer is colorless.
Sulfates: A 2.0-g portion shows no more sulfate than corresponds to 0.2 mL of 0.020 N sulfuric acid (0.01%).
Limit of iron: not more than 20 ppm.
Magnesium and alkaline-earth metals: (0.02%, calculated as Ca).
Heavy metals: not more than 10 ppm.
Potassium Bromide BP
Content: 98.0 per cent to 100.5 per cent (dried substance).
Appearance: White or almost white, crystalline powder or colourless crystals.
Solubility: Freely soluble in water and in glycerol, slightly soluble in alcohol.
A. It gives reaction of bromides.
B. Solution S (see Tests) gives the reactions of potassium.
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.
Acidity or alkalinity: To 10 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 or 0.01 M sodium hydroxide is required to change the colour of the indicator.
Bromates: To 10 ml of solution S add 1 ml of starch solution R, 0.1 ml of a 100 g/l solution of potassium iodide and 0.25 ml of 0.5 M sulphuric acid and allow to stand protected from light for 5 min. No blue or violet colour develops.
Chlorides: Maximum 0.6 per cent.
Iodides: To 5 ml of solution S add 0.15 ml of ferric chloride solution and 2 ml of methylene chloride.
Shake and allow to separate. The lower layer is colourless.
Sulphates: Maximum 100 ppm.
Iron: Maximum 20 ppm.
Magnesium and alkaline-earth metals: Maximum 200 ppm, calculated as Ca.
Heavy metals: Maximum 10 ppm.
Loss on drying: Maximum 1.0 per cent, determined on 1.000 g by drying in an oven at 105C for 3h.
Potassium Bromide ACS Analytical Reagent
Formula Wt 119.00
CAS Number 7758-02-3
Assay: 99.0% KBr
pH of a 5% solution: 5.0-8.8 at 25C
Insoluble matter: 0.005%
Bromate (BrO3): 0.001%
Iodate (IO3): 0.001%
Chloride (Cl): 0.2%
Iodide (I): 0.001%
Nitrogen compounds (as N): 0.005%
Sulfate (SO4): 0.005%
Barium (Ba): 0.002%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 5 ppm
Calcium (Ca): 0.002%
Magnesium (Mg): 0.001%
Sodium (Na): 0.02%
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