Sodium Bromide BP Ph Eur USP Analytical Reagent Grade Manufacturers

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Sodium Bromide CAS Number 7647-15-6, EINECS EC Number 231-599-9, HS Code 282751**, Molecular Weight 102.91, Chemical Formula NaBr

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CHARACTERS
Appearance: White or almost white, granular powder or small, colourless, transparent or opaque crystals, slightly hygroscopic.
Solubility: Freely soluble in water, soluble in ethanol (96 per cent).

IDENTIFICATION
A. It gives reaction (a) of bromides.
B. Solution S (see Tests) gives the reactions of sodium.

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free 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 0.1 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.
Bromates: To 10 mL of solution S add 1 mL of starch solution, 0.1 mL of a 100 g/L solution of potassium iodide and 0.25 mL of 0.5 M sulfuric acid and allow to stand protected from light for 5 min. No blue or violet colour develops.
Chlorides and sulfates: Limits: chlorides: maximum 0.6 per cent; sulfates: maximum 0.01 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.
Iron: Maximum 20 ppm.
Magnesium and alkaline-earth metals: Maximum 200 ppm, calculated as Ca.
Loss on drying: Maximum 3.0 per cent, determined on 1.000 g by drying in an oven at 105C for 3 h.

ASSAY
Dissolve 85.0 mg in water, add 5 mL of dilute nitric acid and dilute to 50 mL with water. Titrate with0.1 M silver nitrate, determining the end-point potentiometrically.
mL of 0.1 M silver nitrate is equivalent to 10.2 mg of NaBr.
Calculate the percentage content of NaBr using the following expression: (a-2.902b)
a = percentage content of NaBr and NaCl obtained in the assay and calculated as NaBr;
b = percentage content of Cl obtained in the test for chlorides.

Sodium Bromide contains not less than 98.0 percent and not more than 100.5 percent of NaBr, calculated on the dried basis. It contains no added substances.

Packaging and storage: Preserve in well-closed containers, and store at room temperature.
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.
Identification:
A: A solution containing 4.0 mg of sodium bromide responds to the test for Bromide.
B: It responds to the test for Sodium.
Acidity or alkalinity: To 10 mL of the solution prepared for the test for Appearance of solution, add 0.1 mL of bromothymol blue: 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 3.0% of its weight.
Bromates:
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: To pass the test. (0.02%, calculated as Ca).
Heavy metals: not more than 10 ppm.

Sodium Bromide Analytical Reagent Grade Specifications
NaBr
Formula Weight: 102.89
CAS Number: 7647-15-6

REQUIREMENTS
Assay (corrected): 99.0% NaBr
pH of a 5% solution: 5.0-8.8 at 25C

MAXIMUM ALLOWABLE
Insoluble matter: 0.005%
Bromate (BrO3): 0.001%
Chloride (Cl): 0.2%
Nitrogen compounds (as N): 5 ppm
Sulfate (SO4): 0.002%
Barium (Ba): 0.002%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 5 ppm
Calcium (Ca): 0.002%
Magnesium (Mg): 0.001%
Potassium (K): 0.1%.

Sodium bromide is a salt with the formula NaBr, widely used as an anticonvulsant and a sedative in the late 19th and early 20th centuries. Its action is due to the bromide ion (potassium bromide is equally effective). It is a high-melting white, crystalline solid that resembles sodium chloride. It is a widely used source of the bromide ion.

NaBr is widely used in organic synthesis as a nucleophile to convert organochlorine compounds to organobromine derivatives, which are more usefully (selectively) reactive.

Sodium bromide can be used as a source of the chemical element bromine. This can be accomplished by bubbling chlorine gas through an aqueous solution of NaBr.

Used as a hypnotic, anticonvulsant, and sedative in medicine. As a source of the bromide ion, which is pharmacologically active, it is equivalent to potassium bromide (see this article for more complete discussion of this topic).

Used to establish a bromide ion reserve in a bromine spa (hot tub) antimicrobial treatment regimen.

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Sodium Bromide Pure	Our Guaranteed Specs.
Sodium Bromide % by wt. of Dried Material	99% Sodium bromide
Chlorides % by Wt. max.	0.5%
Bromates % by Wt. max.	Passes
Heavy Metals Wt. max.	Passes
Iron % by Wt. max.	Passes
Sulphate	Passes
Alkali % by Wt. max.	Passes
Arsenic	10 ppm max
Barium	Passes the test
Moisture % by Wt. max	As agreed