10/03/15 Sher Bindahnee Group members: Claire Lee and Carrie Gale Rm 53 DECOMPOSITION OF COPPER CARBONATE (CuCO3)AIM To investigate the thermal decomposition of copper carbonate. (qualitative assessment)HYPOTHESIS The products of the decomposition of copper carbonate will be a metal oxide (CuO) and carbon dioxide gas.APPARATUS ITEMQUANTITY/CONCENTRATION

Copper carbonate2 g

Limewater (saturated Ca(OH)2 solution)10 mL

Bunsen burner

Matches

Test tubes5

Retort stand, boss head and clamp1

Gas delivery tube and cork stopper1

Sulfuric acid (H2SO4)10 mL 1 mol/L

Spatula1

Copper sulfate3 mL

Cont.

PROCEDUREi) EXPERIMENT DESIGN TABLEVariableDefinitionExperiment variable

Independent variableThe factor changedHeat

Dependent variableThe factor measuredSubstances produced

Constant variablesFactors kept same to make the test fair

ControlThe test to which the experiment is compared

Number of replicatesRepeats decrease error and establish reliability

ii) METHOD1. A spatula was used to 2. II. Preparation of carbon dioxide by decomposition of a carbonate.3. 4. 1. Weigh and record the mass of a large test tube that is clean and dry.5. 6. 2. Weigh out about 2 grams of copper (II) carbonate into the large test tube. Record the exact weight of the test tube + copper (II) carbonate on your lab report.7. 3. Insert a rubber stopper fitted with a rubber delivery tube into the mouth of the large test tube. (See diagram.) Clamp the test tube to a ring stand. Insert a glass tube into the end of the rubber delivery tube. Pour 5 mL of limewater into a small clean test tube. 8. Heat the test tube containing the CuCO3 until you see a change in color. Then insert the glass tube into the limewater. Observe the appearance of the limewater as gas given off by the reaction forms bubbles in the limewater. Continue heating until all of the CuCO3 has changed color. Remove the delivery tube from the limewater when the reaction is complete. Record your observations on your lab report. Be sure to describe the appearance of both of the solids and the gas formed.9. 4. The solid chemical left in the test tube after the reaction is called the residue. After the test tube containing the residue has cooled, weigh it and record the mass of the test tube + residue on your lab report.10. Metals low down in the reactivity series - such as copper - have carbonates that are easily decomposed.DIAGRAM