NaHCO₃
Compound · Salt
Sodium bicarbonate
碳酸氢钠 (小苏打)
Sodium bicarbonate (碳酸氢钠 (小苏打)), formula NaHCO₃, is a salt with a molar mass of 84.01 g/mol (CAS 144-55-8). Fine white crystalline powder; soluble in water; decomposes on heating.
Key facts
| Molar mass | 84.01 g/mol |
|---|---|
| Category | Salt |
| State at 25°C | Solid |
| CAS | 144-55-8 |
Structure
Na⁺ [HCO₃]⁻
Acid salt; its solution is weakly alkaline
Physical properties
| Appearance | Fine white crystalline powder |
|---|---|
| Melting point | — |
| Boiling point | — |
| Density | 2.20 g/cm³ |
| Solubility | Soluble in water; decomposes on heating |
Key reactions
2NaHCO₃ →(Δ) Na₂CO₃ + H₂O + CO₂↑
Thermal decomposition releases CO₂ — used as a leavening agent
NaHCO₃ + HCl → NaCl + H₂O + CO₂↑
Neutralises excess stomach acid / reacts with acids
Main uses
- Baking leavening agent
- Antacid (relieves heartburn)
- Dry-powder fire extinguisher
Hazard
LowNon-toxic; food-grade and widely used
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.