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Word Count: 638
AIM To carry out a lab experiment to decompose a carbonate using heat also to carry out appropriate tests for the formation of products as a result of this decomposition DISSCUSION Carbonates are decomposed by heat into the corresponding oxides and carbon dioxide The temperature of decomposition depends upon the activity of the metal that is to say the more active the metal the more stable is the carbonate Thus the carbonates of sodium and potassium are stable at the highest temperature of a Bunsen burner flame whereas the carbonates of silver and copper are easily decomposed In this experiment copper ii carbonate will be decomposed at a high temperature forming copper ii oxide and carbon dioxide CuCO3s arrow CuOs CO2g You will test for the formation of copper ii oxide and carbon dioxide Limewater is a sensitive test for CO2 forming a distinctive milky precipitate CO2g CaOH2aq arrow CaCO3s H2Ol APPARUTUS fat Pyrex test tubes x 3 medium Pyrex test tubes x 2 holed stopper x 1 bent glass delivery tube x 1 rubber tubing x 1 glass tubing x 1 retort stand x 2 Bunsen burner x 1 Safety glasses x 1 Copperii carbonate Limewater Copperii oxide 5ml of dilute H2SO4 METHOD 1 Transfer a small quantity of CuCO3 equivalent to a depth of 1cm into a test tube 2 Clamp the test tube at an angle of 45 degrees and fit a stoppered delivery tube Immerse the end of the delivery tube into a test tube half-filled with limewater as shown in the diagram 3 Heat the test tube containing the CuCO3 strongly for a few minutes until a colour change in the carbonate and lime water is observed 4 Record your observations of the changes occurring to the CuCO3 and the limewater Testing for
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