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Sodium bicarbonate
1. Basic Information
Name: Sodium bicarbonate
Alias: Sodium hydrogen carbonate, Baking soda
CAS No.: 144-55-8
Molecular Formula: NaHCO3
Molecular Weight: 84.01
Category: Inorganic alkaline salt, food additive, industrial raw material
2. Physical and Chemical Properties
Physical Properties
- Appearance: White crystalline powder or fine crystal
- Odor: Odorless, weak alkaline taste
- Solubility: Slightly soluble in cold water, soluble in hot water; insoluble in ethanol and organic solvents
- Melting Behavior: Decomposes above 50 °C, no fixed melting point
- Hygroscopy: Slightly hygroscopic under high humidity
- Aqueous Property: Weak alkaline aqueous solution, pH value about 8.3 (1% water solution)
Chemical Properties
- Molecular Structure: Ionic inorganic salt composed of Na1+, HCO31-
- Thermal Decomposition: Decompose into sodium carbonate, carbon dioxide and water when heated
- Acid Reaction: Reacts with all acids to release CO2 gas
- Alkaline Reaction: Reacts with strong alkali to generate sodium carbonate
- Photostability: Stable under normal light, no discoloration
- Compatibility: Compatible with most food raw materials; incompatible with strong acid, acidic liquid and ammonium salt
3. Main Application Fields
1. Food Industry (Core Application)
Leavening agent for bakery, pastry, biscuit; acidity regulator for beverage and preserved fruit; food cleaning detergent
2. Pharmaceutical Excipient
Antacid raw material for gastric medicine; buffering agent for injection preparation; external skin cleaning agent
3. Daily Chemical & Household Cleaning
Raw material of toothpaste, bath products; mild environmental cleaning powder for kitchen, tableware and clothing
4. Industrial & Environmental Material
Fire extinguishing agent raw material; flue gas desulfurization absorbent; industrial pH regulator and wastewater treatment agent
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 144-55-8 |
| Molecular Formula | NaHCO3 |
| Appearance | White uniform crystalline powder, no foreign impurities |
| Purity | Food Grade ≥99.0%; Pharma Grade ≥99.5% |
| Water Content | ≤0.25% |
| pH (1% aqueous solution) | 8.0–8.5 |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 25kg food-grade woven bag with PE inner liner |
| Storage Condition | Hermetically sealed dry warehouse below 25 °C; isolate from acid materials and humid environment |
| Transportation Requirement | Common inorganic salt solid, moisture-proof sealed packaging |
| Shelf Life | 36 months under intact sealed packaging |
Safety Warning
Low-toxic inorganic powder. Dust may irritate eyes and respiratory tract. Wear dust mask and protective gloves during operation. Avoid mixing with strong acid to prevent a large amount of carbon dioxide from overflowing. Waste solid and dilute aqueous solution can be treated as general harmless inorganic waste.
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