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Sodium Carbonate (Anhydrous BP) (also known as washing soda, soda ash and soda crystals), Na2CO3, is a sodium salt of carbonic acid (soluble in water). Pure Sodium Carbonate is a white, odorless powder that absorbs moisture from the air, has an alkaline taste, and forms a strongly alkaline water solution. Sodium Carbonate is domestically well known for its everyday use as a water softener. It is synthetically produced in large quantities from salt (sodium chloride) and limestone by a method known as the Solvay process.
Details
| Test | Specifications |
|---|---|
| Characters | A white or almost white, slightly granular powder, hygroscopic, freely soluble in water, practically insoluble in ethanol (96%). |
| Identification A) By Chemical. B) The reaction of ‘Carbonates’. C) The reaction (a) of ‘Sodium’. D) Loss on drying |
A) The solution is strongly alkaline. B) A white precipitate is formed that dissolves on addition of an excess of hydrochloric acid C) A dense white precipitate is formed. D) It complies with the test. |
| Appearance of solution | The solution is clear. |
| Alkali hydroxides and bicarbonates | Complies |
| Chlorides | Not more than 125 ppm. |
| Sulphates | Not more than 250 ppm. |
| Arsenic | Not more than 5 ppm. |
| Iron | Not more than 50 ppm. |
| Heavy metals | Not more than 50 ppm. |
| Loss on Drying | Not more than 1.0% w/w, 1.0 g at 300 ± 15 °C. |
| ASSAY (By Titrimetry) | Not less than 99.5% w/w and not more than the equivalent of 100.5% w/w of Na2CO3, on dried basis. |
Sodium Bicarbonate (IP/BP) or sodium hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium Bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). It is among the food additives encoded by European Union, identified by the initials E 500. Since it has long been known and is widely used, the salt has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda. In colloquial usage, its name is sometimes shortened to sodium bicarb, bicarb soda, or simply bicarb
Sodium Bicarbonate mixed with water can be used as an antacid to treat acid indigestion and heartburn. It is used as the medicinal ingredient in gripe water for infants. Sodium bicarbonate is also used as an ingredient in some mouthwashes. It has anti-caries and abrasive properties.
Specifications
| Arsenic [As] | 2µg/g max. (USP), 2ppm max. (EP/BP/JP) |
|---|---|
| Assay | 99.0 to 100.5% (USP/FCC), 99.0 to 101.0% (EP/BP), 99.0% min. (JP) |
| Calcium [Ca] | 0.01% max. (USP), 100ppm max. (EP/BP) |
| Iron [Fe] | 5µg/g max. (USP), 20ppm max. (EP/BP) |
| Sulfate | 150ppm max. (EP/BP) |
| Appearance of Solution | Pass Test (EP/BP) |
| Ammonium | 20ppm max. (EP/BP), Pass Test (JP) |
| Carbonate | Pass Test (EP/BP/JP) |
| Chloride | 0.015% max. (USP), 150ppm max. (EP/BP), 0.040% max. (JP) |
| Clarity and Color | Pass Test (BP), Clear and Colorless (JP) |
| Heavy Metals | 10ppm max. (EP/BP), 5ppm max. (JP) |
| Identification | Pass Test (USP/FCC/EP/BP/JP) |
| Residual Solvents | Meets Requirements (USP/EP/BP) |
