Specifications :
| Properties | |
|---|---|
| Molecular formula | Na2CO3 |
| Molar mass | 105.9888 g/mol |
| Appearance | White solid, hygroscopic |
| Odor | Odorless |
| Density | 2.54 g/cm3 (25 °C, anhydrous) 1.92 g/cm3 (856 °C) 2.25 g/cm3 (monohydrate) 1.51 g/cm3 (heptahydrate) 1.46 g/cm3 (decahydrate) |
| Melting point | 851°C (1,564°F; 1,124 K) decomposes (anhydrous) 100°C (212°F; 373 K) decomposes (monohydrate) 33.5°C (92.3°F; 306.6 K) decomposes (heptahydrate) 34°C (93°F; 307 K) (decahydrate) |
| Solubility in water | Decahydrate: 7 g/100 mL (0 °C) 16.4 g/100 mL (15 °C) 34.07 g/100 mL (27.8 °C) Heptahydrate: 48.69 g/100 mL (34.8 °C) Monohydrate: 50.31 g/100 mL (29.9 °C) 48.1 g/100 mL (41.9 °C) 45.62 g/100 mL (60 °C) 43.6 g/100 mL (100 °C) |
| Solubility | Soluble in aq. alkalis, glycerol Slightly soluble in aq. alcohol Insoluble in CS2, acetone, alkyl acetates, alcohol, benzonitrile, liquid ammonia[4] |
| Solubility in glycerine | 98.3 g/100 g (15.5 °C) |
| Solubility in ethanediol | 3.46 g/100 g (20 °C) |
| Solubility in dimethylformamide | 0.5 g/kg |
| Basicity (pKb) | 3.67 |
| Magnetic susceptibility | 4.1·105 cm3/mol |
| Refractive index (nD) | 1.485 (anhydrous) 1.420 (monohydrate) 1.405 (decahydrate) |
| Viscosity | 3.4 cP (887 °C) |