Copper(II) carbonate

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Copper(II) carbonate
Image:Basic copper(II) carbonate.jpg
Systematic name	Copper(II) carbonate
Other names	copper carbonate, cupric carbonate
Molecular formula	CuCO₃
Molar mass	123.56 g/mol
CAS number	12069-69-1
Density	3.9 g/cm³
Solubility (water)	Insoluble in water
Melting point	200°C
Boiling point	None Applicable
Disclaimer and references

Copper(II) carbonate (often called copper carbonate or cupric carbonate) is a blue-green compound (chemical formula CuCO₃) forming most of the patina one sees on weathered brass, bronze, and copper. The colour can vary from bright blue to green, because there may be a mixture of both copper carbonate and basic copper carbonate in various stages of hydration. It was formerly much used as a pigment, and is still in use for artist's colours. It has also been used in some types of make-up, like lipstick, although it can also be poisonous to humans. It also has been used for many years as an effective algaecide in farm ponds and in aquaculture operations.

Copper carbonate decomposes at high temperatures, giving off carbon dioxide and leaving copper(II) oxide.

CuCO₃(s) ---> CuO(s) + CO₂(g)

Basic copper(II) carbonate occurs naturally as malachite (CuCO₃.Cu(OH)₂) and azurite (Cu₃(CO₃)₂(OH)₂).

[edit] Precautions

Copper carbonate is an eye irritant. It may be harmful when inhaled or swallowed. Wear safety glasses when handling copper carbonate.

While in use of Copper (II) carbonate be very percise, for any "slip up" can cause an eye irritant related or inhalation problem. if this happens be sure to induce vomiting and or drink 1-1/2 cups of milk;or water.