Decomposition of copper carbonate, 3 of 3. A test tube with copper carbonate (CuCO3) is placed over a Bunsen burner flame. When heated, pale-green copper carbonate turns into black copper oxide (CuO) and carbon dioxide (CO2) gas. This is an example of a decomposition reaction: CuCO2 -> CuO + CO2. Generated carbon dioxide gas (CO2) passes through tubing and bubbles through lime water (saturated calcium hydroxide, Ca(OH)2). Calcium carbonate (CaCO3) precipitates out of solution giving the solution a cloudy appearance: Ca(OH)2 + CO2 -> CaCO3 + H2O. | |
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