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Sodium Hydrogen Carbonate
Sodium Bicarbonate BP
84.0 — 144-55-8
Action and use
Antacid; used in treatment of electrolyte deficiency.
99.0 per cent to 101.0 per cent.NaHCO3
White or almost white, crystalline powder.
Soluble in water, practically insoluble in ethanol (96 per cent). When heated in the dry state or in solution, it gradually changes into sodium carbonate.
A. To 5 ml of solution S add 0.1 ml of phenolphthalein solution. A pale pink colour is produced. Heat; gas is evolved and the solution becomes red.
B. It gives the reaction of carbonates and bicarbonates.
C. Solution S gives reaction of sodium.
Dissolve 5.0 g in 90 ml of carbon dioxide-free water and dilute to 100.0 ml with the same solvent.
Appearance of solution
Solution S is clear and colourless.
The pH of freshly prepared solution S is not greater than 8.6
Maximum 150 ppm
Maximum 150 ppm
Maximum 20 ppm.
Maximum 2 ppm, determined on 0.5 g.
Maximum 100 ppm.
To a suspension of 1.0 g in 10 ml of distilled water add hydrochloric acid until neutral and dilute to 15 ml with distilled water.
Maximum 20 ppm.
Maximum 10 ppm.
Sodium Bicarbonate USP
Carbonic acid monosodium salt
Sodium Bicarbonate contains not less than 99.0 percent and not more than 100.5 percent of NaHCO3, calculated on the dried basis.
Labeling— Where Sodium Bicarbonate is intended for use in hem dialysis, it is so labeled.
Identification— A solution of it meets the requirements of the tests for Sodium 191 and for Bicarbonate.
Loss on drying— Dry about 4 g, accurately weighed, over silica gel for 4 hours: it loses not more than 0.25% of its weight.
Insoluble substances— Dissolve 1 g in 20 mL of water: the resulting solution is complete and clear.
Carbonate (where it is labeled as intended for use in hem dialysis)— The limit of carbonate is not more than 0.23%. to be determined as per tests defined.
Normal carbonate— Add 2.0 mL of 0.10 N hydrochloric acid and 2 drops of phenolphthalein TS to 1.0 g of Sodium Bicarbonate, previously dissolved without agitation in 20 mL of water at a temperature not exceeding 15 : the solution does not assume more than a faint pink color immediately.
Chloride—: a 0.35-g portion shows no more chloride than corresponds to 1.48 mL of 0.0010 N hydrochloric acid (0.015%).
Limit of sulfur compounds— To pass the test
Aluminum (where it is labeled as intended for use in hem dialysis)— The limit is 2 µg per g.
Arsenic— The limit is 2 µg per g.
Calcium and magnesium (where it is labeled as intended for use in hem dialysis)
— the percentage of Ca in the specimen limit is 0.01%.
— the percentage of Mg in the specimen the limit is 0.004%.
Copper (where it is labeled as intended for use in hem dialysis)— Cu in the specimen the limit is 1 µg per g.
Iron (where it is labeled as intended for use in hem dialysis)— not more than 5µg per g.
Heavy metals—the limit is 5 µg per g.
Limit of ammonia— to pass the test
Limit of organics (where it is labeled as intended for use in hem dialysis)— To pass the test
Sodium Hydrogen Carbonate; Baking Soda.
Sodium Bicarbonate FCC
NaHCO3 Formula wt 84.01
INS: 500(ii) CAS: [144-55-8]
Sodium Bicarbonate occurs as a white, crystalline powder. It is stable in dry air, but it slowly decomposes in moist air. One gram dissolves in 10 mL of water. It is insoluble in alcohol. Its solutions, when freshly prepared with cold water without shaking, are alkaline to litmus. The alkalinity increases as the solutions stand, are agitated, or are heated.
Function: pH control agent; leavening agent.
Identification: A 1:10 aqueous solution gives positive tests for Sodium and for Bicarbonate.
Assay: Not less than 99.0% and not more than 100.5% of NaHCO3 after drying.
Ammonia: Passes test.
Insoluble: Substances Passes test.
Lead: Not more than 2 mg/kg.
Loss on Drying: Not more than 0.25%.
Sodium Hydrogen Carbonate ACS
Formula Wt 84.01
CAS Number 144-55-8
Assay (dried basis): 99.7-100.3% NaHCO3
Insoluble matter: 0.015%
Chloride (Cl): 0.003%
Phosphate (PO4): 0.001%
Sulfur compounds (as SO4): 0.003%
Ammonium (NH4): 5 ppm
Heavy metals (as Pb): 5 ppm
Iron (Fe): 0.001%
Calcium (Ca): 0.02%
Magnesium (Mg): 0.005%
Potassium (K): 0.005%