Sodium carbonate, Na2C03, also known as soda or soda ash,is the most important of the industrial alkalis. Sodium carbonate is a kind of important raw material for chemical industry with wide application.
Soda ash is the important raw material for making glass, soaps, detergents, textiles, leather, spices, dyes, medicines, etc. It can be used for analysis reagents and also used for the pharmaceutical industry and photoengraving.
It has numerous functions: an antioxidant, a curing and pickling agent, a flavoring agent, a processing aid, a sequestrant, and an agent for ph control. It is used in instant soups to neutralize acidity. It is used in alginate water des- sert gels to sequester the calcium, allowing the alginate to solubilize. It is also used in puddings, sauces, and baked goods.
Basic Information
| Foreign name | Sodium carbonate |
| alias | soda 、 soda ash |
| chemical formula | N82CO3 |
| cas | 67-68-5 |
| UNDangerous goods number | 3082 |
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Physical and chemical properties
Sodium carbonate is white odorless powder or granules at room temperature, with a density of 2.54g/cm3 and a melting point of 856ºC. Soluble in water, also soluble in glycerin, 20 grams of sodium carbonate can be dissolved per 100 grams of water at 20 ° C, the solubility is the largest at 35.4 ° C, 49.7 grams of sodium carbonate can be dissolved in 100 grams of water, slightly soluble in absolute ethanol, insoluble Compared with propanol, the PH of 1% aqueous solution is 11.5, it can conduct electricity in aqueous solution or molten state, and the aqueous solution has astringent taste and slippery feeling. Sodium carbonate is hygroscopic, and it will gradually absorb 1mol/L water (approximately = 15%) when placed in the air. Its hydrates include Na2CO3·H2O, Na2CO3·7H2O and Na2CO3·10H2O .
chemical properties
The aqueous solution of sodium carbonate is alkaline and has certain corrosiveness. It can undergo metathesis reaction with acid, and can also undergo metathesis reaction with some calcium salts and barium salts. The solution is alkaline and can turn phenolphthalein red.
Stability
Strong stability, but can also be decomposed at high temperature to generate sodium oxide and carbon dioxide;
Long-term exposure to the air can absorb moisture and carbon dioxide in the air, generate sodium bicarbonate, and form hard lumps;
The crystalline hydrate of sodium carbonate (Na2CO3·10H2O) is easily weathered in dry air;
Use
1. Glass: the glass industry is a large consumer sector of soda ash. soda consumption per ton of glass is 0.2T.
2. Detergent: It is used as detergent in wool rinsing, medicine and tanning.
3. Printing and dyeing: printing and dyeing industry is used as a water softener.
4. Buffer: as buffering agent, neutralize and dough improver, it can be used for pastry and noodle food, and can be used appropriately according to production needs, etc