Na₂CO₃
Compound · Salt
Sodium carbonate
碳酸钠 (纯碱)
Sodium carbonate (碳酸钠 (纯碱)), formula Na₂CO₃, is a salt with a molar mass of 105.99 g/mol (CAS 497-19-8). White powder; soluble in water; solution is alkaline due to hydrolysis.
Key facts
| Molar mass | 105.99 g/mol |
|---|---|
| Category | Salt |
| State at 25°C | Solid |
| CAS | 497-19-8 |
Structure
(Na⁺)₂ [CO₃]²⁻
Salt of a strong base and weak acid; its solution is alkaline
Physical properties
| Appearance | White powder |
|---|---|
| Melting point | 851 °C |
| Boiling point | — |
| Density | 2.54 g/cm³ |
| Solubility | Soluble in water; solution is alkaline due to hydrolysis |
Key reactions
Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂↑
Reacts with acid, releasing CO₂
Na₂CO₃ + Ca(OH)₂ → CaCO₃↓ + 2NaOH
Causticisation to make sodium hydroxide
Main uses
- Primary raw material for glass
- Detergents and water softening
- Paper and textiles
Hazard
LowMildly alkaline; can slightly irritate skin and eyes
Constituent elements
Data sources
Molar mass is computed from IUPAC (CIAAW) standard atomic weights; formula, properties and reactions can be verified on PubChem, NIST and Wikipedia. The CAS number is the substance's unique registry identifier. Educational reference only.