C₂H₂O₄ Oxalic Acid
Wholesale Buy Oxalic Acid Anhydrous Ethanedioic Acid Price for Sale
Chinese Name: Oxalic Acid (Ethanedioic Acid)
Assay (Purity): 99.99%
CAS No.: 6153-56-6 (Note: Common anhydrous form is 144-62-7)
EINECS No.: 205-634-3
Molecular Formula: C₂H₂O₄
Molecular Weight: 90.04 (Anhydrous)
Hazard Identification Number: 81614
UN Number: 3261
Hazard Classification: Class 8 Corrosive Substance (Acidic)
CERTIFICATES
C₂H₂O₄ Oxalic Acid
I. Physicochemical Properties
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Appearance & Characteristics
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Anhydrous: White crystalline powder or columnar crystals, hygroscopic, absorbs moisture from air.
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Industrial grade may appear light gray or pale yellow due to trace impurities, without affecting performance.
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Key Physical Parameters
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Relative Density (water = 1, 20°C): 1.90 g/cm³
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Melting Point: 189.5°C (decomposes to CO, CO₂ and H₂O)
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Solubility: Highly soluble in water (14.3g/100mL at 20°C); soluble in ethanol and ether; slightly soluble in benzene and chloroform.
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Aqueous Solution: Strongly acidic (pH ≈1.3 for 0.1 mol/L solution).
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Chemical Stability
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Stable at room temperature; exhibits reducibility and corrosiveness.
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Reacts with strong oxidizers (e.g., potassium permanganate), metals (e.g., iron, zinc), and bases.
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Decomposes at high temperatures, releasing toxic carbon monoxide.
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II. Quality Standards (Industrial Grade, GB/T 1626-2008)
| Parameter | Premium Grade | First Grade | Qualified Grade | Test Result |
|---|---|---|---|---|
| Oxalic Acid Content (%) | ≥99.6 | ≥99.0 | ≥96.0 | 99.99 |
| Sulfate (as SO₄) (%) | ≤0.07 | ≤0.10 | ≤0.20 | <0.005 |
| Residue on Ignition (%) | ≤0.01 | ≤0.08 | ≤0.20 | 0.007 |
| Heavy Metals (as Pb) (%) | ≤0.0005 | ≤0.001 | ≤0.02 | <0.0001 |
| Iron (as Fe) (%) | ≤0.0005 | ≤0.0015 | ≤0.01 | 0.0001 |
| Chloride (as Cl) (%) | ≤0.0005 | ≤0.002 | ≤0.01 | <0.0005 |
| Calcium (as Ca) (%) | ≤0.0005 | — | — | 0.0001 |
III. Main Application Fields
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Industrial Applications (>80% usage):
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Mining: Extraction and separation of rare earth elements.
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Metal Processing: Rust and oxide removal; metal polishing.
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Textile Industry: Bleaching agent and mordant for cotton/linen.
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Chemical Synthesis: Production of oxalates, pharmaceuticals, and pesticides.
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Leather Industry: Tanning agent for improved softness and durability.
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Other Fields:
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Environmental: Wastewater treatment for metal ion removal and chromium reduction.
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Laboratory: Analytical reagent and culture medium preparation.
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Household: Cleaning agent for descaling and stain removal.
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IV. Safety & Protection Guidelines
(I) Hazard Overview
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Health Hazards: Toxic and corrosive. Oral lethal dose ~15–30g for adults. Causes skin/eye damage, respiratory irritation, and organ failure if ingested.
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Environmental Risks: Acidifies water; forms stable complexes with metal ions.
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Fire/Explosion: Non-flammable but reacts vigorously with oxidizers; decomposes to CO at high temperatures.
(II) Handling & Storage
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Operations:
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Use acid-resistant gloves (nitrile), goggles, chemical suits, and dust masks.
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Always add acid to water slowly with stirring. Ensure ventilation.
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Separate from oxidizers, alkalis, and metal powders.
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Storage:
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Cool (≤30°C), dry, ventilated area; sealed PE plastic or lined steel drums.
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Separate from foodstuffs, oxidizers, and alkalis; provide spill containment.
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(III) Emergency Measures
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Spills: Isolate area. Neutralize with sand/lime; collect in corrosion-resistant containers.
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First Aid:
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Skin/Eyes: Flush with water for 15 min; seek medical care.
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Inhalation: Move to fresh air; administer oxygen if needed.
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Ingestion: Drink milk/egg white; DO NOT induce vomiting.
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Firefighting: Use water spray; wear full protective gear. Employ dry powder/CO₂ for oxidizer-related fires.
(IV) Transportation
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Packed in woven bags with inner liner.
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Use certified corrosive-resistant vehicles; never mix with food/oxidizers/alkalis.
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Avoid sunlight, rain, and high temperatures; carry neutralizers and emergency tools.
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