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Copper(II) oxide

Copper(II) oxide, with the chemical formula CuO, is an inorganic compound containing copper in its +2 oxidation state. It is one of the most common oxides of copper, the other being copper(I) oxide (Cu2O). Copper(II) oxide is also known as cupric oxide.

Preparation of Copper(II) Oxide: Copper(II) oxide can be prepared by the thermal decomposition of copper(II) nitrate, copper(II) hydroxide, or copper(II) carbonate:

2 Cu(NO3)2 → 2 CuO + 4 NO2 + O2

Cu(OH)2 → CuO + H2O

CuCO3 → CuO + CO2

Properties and Uses of Copper(II) Oxide:

  • Appearance: Copper(II) oxide is a black or dark brown solid. Its color may vary depending on the particle size and crystallinity.
  • Insolubility: It is insoluble in water and most common solvents.
  • Applications: Copper(II) oxide has various applications in different industries. It is used as a pigment in ceramics and as a coloring agent in glass. It is also utilized in the production of certain electrical components, as a catalyst in chemical reactions, and as a material for high-temperature superconductors.

Safety Considerations: Copper(II) oxide is generally considered to be of low toxicity. However, like other copper compounds, it should be handled with care, and safety precautions should be followed. Avoid inhaling the dust and prevent skin contact by wearing appropriate personal protective equipment (PPE).

As with all chemicals, it is essential to consult the Material Safety Data Sheet (MSDS) and follow strict safety protocols when working with copper(II) oxide.


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