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Sodium Bromide
1. Basic Information
Name: Sodium Bromide
Alias: NaBr
CAS No.: 7647-15-6
Molecular Formula: NaBr
Molecular Weight: 102.89
Category: Inorganic bromide salt, industrial raw material, photographic chemical, analytical reagent
2. Physical and Chemical Properties
Physical Properties
- Appearance: White crystalline powder or granular crystal
- Odor: Odorless, slightly bitter salty taste
- Solubility: Easily soluble in water; soluble in methanol, glycerol; slightly soluble in ethanol; insoluble in acetone, ether
- Melting Point: 755 °C
- Boiling Point: 1390 °C
- Hygroscopy: Slightly hygroscopic, absorbs moisture in humid air to agglomerate
- Aqueous Property: Neutral aqueous solution (pH≈7)
Chemical Properties
- Molecular structure: Ionic compound composed of Na? and Br?
- Precipitation reaction: Bromide ion reacts with Ag?, Pb2? to form insoluble silver bromide, lead bromide precipitate
- Redox property: Oxidized by chlorine, hydrogen peroxide, concentrated nitric acid to generate elemental bromine with orange-red color
- Thermal stability: Stable at room temperature; high temperature molten state without decomposition
- Compatibility: Compatible with neutral inorganic salts; incompatible with strong oxidants, silver salts, concentrated strong acids
3. Main Application Fields
1. Photographic Industry (Core Application)
Raw material for silver bromide photosensitive emulsion, used for film, photographic paper manufacturing
2. Oil & Gas Drilling
Bromide brine preparation for high-density completion fluid, well control weighting agent
3. Chemical Synthesis
Source of bromide ion for organic bromination reactions, catalyst auxiliary
4. Medicine & Analytical Reagent
- Medical grade: Sedative raw material, bromide ion preparation
- Lab reagent: Standard bromide solution for titration, precipitation analysis
5. Water Treatment
Bromine biocide precursor for circulating water disinfection
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 7647-15-6 |
| Molecular Formula | NaBr |
| Appearance | Uniform white crystal without lumps |
| Purity | Industrial grade ≥98.0%; AR grade ≥99.0% |
| Water insoluble matter | ≤0.02% |
| Chloride impurity | ≤0.5% |
| Water content (KF) | ≤0.30% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 25kg woven bag with PE inner film / plastic drum |
| Storage Condition | Sealed dry warehouse below 25 ℃, avoid damp and oxidants |
| Transportation Requirement | Ordinary inorganic salt solid, moisture-proof packaging, separate from strong oxidants |
| Shelf Life | 36 months under sealed storage |
Safety Warning
Mild irritant inorganic salt. Dust irritates eyes and respiratory tract; excessive long-term oral intake causes bromism (drowsiness, skin rash, nerve disturbance). Operation with ventilation, wear dust mask and rubber gloves. When mixed with strong oxidants, toxic bromine vapor may be released. Waste water can be diluted and discharged; solid waste belongs to general inorganic industrial waste.
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