Sodium Acetate Trihydrate
Basic Information
Name: Sodium Acetate Trihydrate
Other names: Sodium ethanoate trihydrate
Molecular formula: CH₃COONa·3H₂O (CH₃COONa·3H₂O)
Molecular weight: 136.08
CAS number: 6131-90-4
2.Physical and Chemical Properties
- Appearance: Colorless transparent crystals
- Melting point: Approximately 58 °C (melts in its own water of crystallization)
- Density: Approximately 1.45 g/cm³
- Solubility: Highly soluble in water (about 76 g/100 mL at 0 °C); soluble in ethanol
- Aqueous solution: Weakly alkaline (pH about 8.5–9.0)
- Stability: Effloresces in dry air (loses water of crystallization); slightly hygroscopic
3.Main Functions and Applications (What are its uses?)
- Buffering agent (core application): The acetic acid / sodium acetate buffer is one of the most widely used buffer systems, applied for precise pH control in pharmaceutical, biochemical, textile, electroplating and photographic- fixing processes.
- Phase-change heat storage (characteristic application): The supersaturated solution of sodium acetate trihydrate releases heat on crystallization, serving as the core component of hand warmers and hot packs as a phase-change energy-storage material.
- Food: Preservative, acidity regulator and flavoring agent (E262).
- Pharmaceutical: Alkaline drug, antacid, dialysate component and auxiliary ingredient for osmotic diuretics.
- Textile and dyeing: Mordant, buffering agent and pH regulator.
- Chemical industry: Raw material for glacial acetic acid, acetic anhydride and acetate esters.
- Water treatment: pH adjustment.
- Electroplating: pH buffering agent and conducting salt.
4.A Benchmark-Level Industrial Masterpiece - A Meticulously Crafted "Food-Grade" Buffering Crystalline Salt!
Sodium acetate content ≥ 99.0% (food grade per GB 30603).
Low free alkali, low arsenic, lead and heavy metals - food-grade safety.
High purity and excellent buffering capacity.
"What you see is what you get" - every lot ships with a complete certificate of analysis.
Product Specification - Sodium Acetate Trihydrate
|
Item |
Specification |
|
Product model |
Sodium Acetate Trihydrate (CH3COONa·3H2O) |
|
Appearance |
Colorless transparent crystals |
|
Sodium acetate content (as CH3COONa·3H2O, %) |
≥ 99.0 |
|
Free alkali (as NaOH, %) |
≤ 0.2 |
|
Water-insoluble matter (%) |
≤ 0.03 |
|
Arsenic (As, ppm) |
≤ 3 |
|
Lead (Pb, ppm) |
≤ 2 |
|
Heavy metals (as Pb, ppm) |
≤ 10 |
|
pH (1% aqueous solution) |
7.5 – 9.0 |
|
Loss on drying (%) |
38.0 – 41.0 |
|
Packaging |
25 kg kraft bag with PE inner / 25 kg woven bag |
- Test methods reference: sodium acetate content by acid-base titration (GB 30603); free alkali by acid-base titration; water-insoluble matter by gravimetric method (GB/T 9738); loss on drying by oven-drying; arsenic by molybdenum blue method; lead / heavy metals by atomic absorption or colorimetric method.
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