What is the material left behind in the evaporating dish after decomposition of copper ii carbonate? How do you know? Write and equation for the decomposition.
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Copper(II) carbonate (often called copper carbonate or cupric carbonate) is a blue-green compound (chemical formula CuCO3) forming part of the verdigris patina that is found 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 toxic to humans. It also has been used for many years as an effective algaecide in farm ponds and in aquaculture operations. Copper carbonate was the first compound to be broken down into several, separate elements (copper, carbon, and oxygen). It was broken down in 1794 by the French chemist Joseph Louis Proust (1754–1826). When burnt, it thermally decomposes to form CO2 and CuO, a black solid. It can be used to copper plate a metallic surface by adding sulfuric acid and heat it (to produce copper sulfate) then passing a charge through it with the metal in the liquid. This process is known as electroplating. Basic copper(II) carbonate patina on roofs of Ch?teau Frontenac. Copper in moist air slowly acquires a dull green coating because its top layer has oxidised with the air. Some architects use this material on rooftops for this interesting colour. The green material is a 1:1 mole mixture of Cu(OH)2 and CuCO3:[1] 2 Cu (s) + H2O (g) + CO2 + O2 → Cu(OH)2 + CuCO3 (s) Copper carbonate decomposes at 290 °C, giving off carbon dioxide and leaving copper(II) oxide: CuCO3 (s) → CuO (s) + CO2 (g) Basic copper(II) carbonate occurs naturally as malachite (Cu2(OH)2CO3) and azurite (Cu3(OH)2(CO3)2).
