Sodium Carbonate
Soda Ash, Washing Soda
- CAS
- 497-19-8
- EC
- 207-838-8
- Food Code
- E500
- Sectors
- Water & Wastewater Treatment, Food & Nutrition, Building & Construction
Sodium carbonate, or soda ash, is a white, hygroscopic powder or granules with formula Na2CO3 and molecular weight 105.99 g/mol. Density 2.54 g/cm³ (anhydrous), melting point 851°C, decomposes before boiling. Soluble in water (215 g/L at 20°C), forming alkaline solutions pH 11-12; insoluble in organics. Absorbs moisture and CO2 from air. Exists as anhydrous, monohydrate, or decahydrate; produced via Solvay process from NaCl and limestone.
Typical Properties
| Molecular formula | CH2O3.2Na |
|---|---|
| Molecular weight | 105.99 g/mol |
| Appearance | white odourless powder |
| Form | Solid |
| Color | White |
| Odor | at 100.00?%. odorless |
| Melting point | 851 °C |
| Boiling point | 1600 °C |
| Density | 2.53 g/cm³ |
| Water solubility | 22 g/100 mL (20 °C) |
| pH | 11.16 (4g/l, H2O, 25°C) |
| GHS signal word | Warning · Corrosive, Irritant / harmful |
| HS code | 28362000 |
| Grades available | Food Grade, Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Sodium Carbonate
Applications
In glass production, detergents, water softening, pH control in mining, effervescent tablets, and food as acidity regulator.
Safety & Risks
Irritates eyes; mildly toxic if ingested. GRAS by FDA/EPA; avoid acids to prevent CO2 release. Not hazardous for transport.
Packaging
In 25-50kg bags or bulk supersacks. Store dry to avoid caking.