min. 99.5% copper oxalate, pure, powder, copper(II) oxalate, CuC2O4, CAS No.: 814‑91‑5
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Product information "min. 99.5% copper oxalate, pure, powder, copper(II) oxalate, CuC2O4, CAS No.: 814‑91‑5"
Copper oxalate (also copper(II) oxalate or cupric oxalate, CAS 814-91-5) is the copper salt of oxalic acid. It occurs as a blue- to bluish-white, odorless powder. Its empirical formula is CuC2O4 (molar mass ≈ 151.56 g·mol-1). The substance has a density of about 6.57 g cm-3 and decomposes on heating at around 300–310 °C, forming copper oxide. Copper oxalate is practically insoluble in water and settles out; however, it dissolves in ammoniacal solution (NH4OH). The salt is largely stable but decomposes explosively when heated and should be kept away from acetylene, ammonia, strong bases, oxidizing agents, and nitromethane.
Applications
Because of its chemical properties, copper oxalate is used primarily as a catalyst for organic reactions and a stabilizer for acetylated polyoxymethylenes. In addition, the salt is employed as a seed dressing to deter birds and rodents. In industry it also serves as a precursor for other copper compounds and—together with ammonia—as a reducing agent. Owing to its high specific copper content and low decomposition temperature, it acts as a colorant in very specialized pyrotechnic compositions.
Chemical and physical properties
- Empirical formula: CuC2O4
- CAS No.: 814-91-5 (anhydrous) or 5893-66-3 (hemihydrate)
- Molar mass: approx. 151.56 g·mol-1
- Appearance: blue- to bluish-white, odorless solid
- Density: approx. 6.57 g cm-3
- Melting/decomposition point: decomposes at about 300–310 °C to copper oxide
- Water solubility: practically insoluble in water; the solubility product Ksp is 4.43 × 10-10; soluble in ammoniacal solution
- Reactivity: dissolves in aqueous ammonia; can act as an acid with bases and as a reducing agent; reacts dangerously with acetylene, strong bases, and oxidizing agents and should not be overheated
SIGNAL WORD: WARNING!
Hazard statements (H-phrases)
- H302: Harmful if swallowed.
- H312: Harmful in contact with skin.
Precautionary statements (P-phrases)
- P280: Wear protective gloves/protective clothing/eye protection/face protection.
- P312: Call a POISON CENTER or doctor if you feel unwell.
- P321: Specific treatment required (see safety data sheet).
- P330: Rinse mouth.
- P360/P362: Immediately take off contaminated clothing and wash before reuse.
- P391: Collect spillage.
- P501: Dispose of contents/container to an approved waste-disposal facility.
| CAS-Nr.: | 814‑91‑5 |
|---|---|
| Color: | Blau |
| Kupfer: | 44,5 % |
| Produktcharakter: | feines Pulver |
| SO4: | max. 0,5 % |
| Stoffgruppe: | Oxalate |
| Trocknungsverlust bei 105° C, 2h: | max. 4,0 % |
| kind of product: | chemical |
| material: | Kupferoxalat |
| zur GPSR-Informationspflicht: | Hersteller + Verantwortliche Person: Werth-Metall, Ringstr. 41b, 99428 Grammetal, info@werth-metall.de |
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