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Sodium Fluoride

Sodium fluoride USP BP Analytical Reagent Supplier, Manufacturer's Representative, CAS Number 7681-49-4

CAS number : 7681-49-4
Molecular Weight: 41.99
Chemical Formula: NaF

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DESCRIPTION

Sodium fluoride is an inorganic chemical compound with the formula NaF. A colorless solid, it is a source of the fluoride ion in diverse applications. Sodium fluoride is less expensive and less hygroscopic than the related salt potassium fluoride.

Sodium Fluoride USP Grade
Formula: NaF
Weight: 41.99
CAS Number: 7681-49-4
Sodium Fluoride contains not less than 98.0 percent and not more than 102.0 percent of NaF, calculated on the dried basis.

Identification:
A: Place 1 g in a platinum crucible in a well-ventilated hood, add 15 mL of sulfuric acid, and cover the crucible with a piece of clear, polished glass. Heat the crucible on a steam bath for 1 hour, remove the glass cover, rinse it in water, and wipe dry: the surface of the glass is etched.
B: A solution (1 in 25) responds to the tests for Sodium.

Tests:
Acidity or alkalinity: Dissolve 2.0 g in 40 mL of water in a platinum dish, add 10 mL of a saturated solution of potassium nitrate, cool the solution to 0 , and add 3 drops of PhPh. If no color appears, a pink color persisting for 15 seconds is produced by not more than 2.0 mL of 0.10 N sodium hydroxide. If the solution is colored pink by the addition of PhPh, it is rendered colorless by not more than 0.50 mL of 0.10 N sulfuric acid. Save the neutralized solution for the test for Fluosilicate.
Loss on drying: Dry it at 150 for 4 hours: it loses not more than 1.0% of its weight.
Fluosilicate: After the solution from the test for Acidity or alkalinity has been neutralized, heat to boiling, and titrate while hot with 0.10 N sodium hydroxide until a permanent pink color is obtained: not more than 1.5 mL of 0.10 N sodium hydroxide is required.
Chloride: Dissolve 300 mg in 20 mL of water, and add 200 mg of boric acid, 1 mL of nitric acid, and 1 mL of 0.1 N silver nitrate: any turbidity produced is not greater than that of a blank to which has been added 1.0 mL of 0.0010 N hydrochloric acid (0.012%).
Heavy metals: To 1 g, in a platinum dish or crucible, under a hood, add 1 mL of water and 3 mL of sulfuric acid, and heat at as low a temperature as practicable until all of the sulfuric acid has been expelled. Dissolve the residue in 20 mL of water, neutralize the solution to PhPh with ammonium hydroxide, add 1 mL of glacial acetic acid, dilute with water to 45 mL, filter, and use 30 mL of the filtrate for the test: the limit is 0.003%.

Sodium Fluoride BP Grade Ph Eur
DEFINITION
Content: 98.5 per cent to 100.5 per cent (dried substance).

CHARACTERS
Appearance: White or almost white powder or colourless crystals.
Solubility: Soluble in water, practically insoluble in ethanol (96 per cent).

IDENTIFICATION
A. To 2 ml of solution S (see Tests) add 0.5 ml of calcium chloride solution R. A gelatinous white precipitate is formed that dissolves on adding 5 ml of ferric chloride solution R1.
B. To about 4 mg add a mixture of 0.1 ml of alizarin S solution R and 0.1 ml of zirconyl nitrate solution R and mix. The colour changes from red to yellow.
C. Solution S gives reaction (a) of sodium.

TESTS
Solution S: Dissolve 2.5 g in carbon dioxide-free water R without heating and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear (2.2.1) and colourless.
Acidity or alkalinity: Dissolve 2.5 g of potassium nitrate R in 40 ml of solution S and dilute to 50 ml with carbon dioxide-free water R. Cool to 0 °C and add 0.2 ml of PhPh solution R. If the solution is colourless, not more than 1.0 ml of 0.1 M sodium hydroxide is required to produce a red colour that persists for at least 15 s. If the solution is red, not more than 0.25 ml of 0.1 M hydrochloric acid is required to change the colour of the indicator.
Chlorides: Maximum 200 ppm.
Fluorosilicates: Heat to boiling the neutralised solution obtained in the test for acidity or alkalinity and titrate whilst hot. Not more than 0.75 ml of 0.1 M sodium hydroxide is required to change the colour of the indicator to red.
Sulphates: Maximum 200 ppm.
Loss on drying: Maximum 0.5 per cent, determined on 1.000 g by drying in an oven at 130°C for 3 h.

Sodium Fluoride Analytical Reagent Grade
Molecular Formula: NaF
Weight: 41.99
CAS Number: 7681-49-4

REQUIREMENTS
Assay: 99% NaF

MAXIMUM ALLOWABLE
Insoluble matter: 0.02%
Loss on drying at 150C: 0.3%
Chloride (Cl): 0.005%
Titrable acid: 0.03 meq/g
Titrable base: 0.01 meq/g
Sodium fluosilicate (Na2SiF6): 0.1%
Sulfate (SO4): 0.03%
Sulfite (SO2): 0.005%
Heavy metals (as Pb): 0.003%
Iron (Fe): 0.003%
Potassium (K): 0.02%


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