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The Decomposition of Copper Carbonate

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Introduction

The Decomposition of Copper Carbonate - Planning Coursework Aim Our project is to find out what products are formed when copper carbonate decomposes. Copper has 2 oxides, Cu2O and CuO. We are told that one of the following two equations are correct: Equation 1 (Eqn1): 2 CuCO3 (s) --> Cu2O (s) + 2 CO2 (g) + 1/2 O2 (g) Equation 2 (Eqn2): CuCO3 (s) --> CuO (s) + CO2 (g) Calculations I have to find out which of the two are correct by experimentation. By looking at the equations, I can see that gas is given out. Collecting this gas will be a good way to find out which equation is correct. I will collect the gas in a 100cm3 gas syringe. Therefore I want to be collecting about 80cm3 of gas per amount of copper carbonate. Eqn1 Ratio copper carbonate : gas 2 : 2 + 1/2 1 : 1.25 Eqn2 Ratio copper carbonate : gas 1 : 1 Above states that 2 1/2 moles of gas are produced in Eqn1. ...read more.

Middle

retort stand and also the boiling tube being held by tongues Method * Weigh exactly about 0.329g powdered copper carbonate * Set out apparatus as above * Put copper carbonate into boiling tube and put bung on. Bung should be as tight as possible to ensure it is air tight and to minimise the amount of gas lost * Attach delivery tube to gas syringe making sure plunger is fully depressed * Light the Bunsen on a yellow flame for safety and then turn it to a blue flame when ready to begin experiment * Apply Bunsen burner under boiling tube, wafting it under the copper carbonate * I know when the reaction has stopped by when the copper carbonate has gone red or black (depending whether Cu2O or CuO is produced). * Also, when the reaction stops, the plunger on the gas syringe will stop moving * It might be necessary to wait to let the syringe and its contents to cool down so that the gas occupies the correct volume I need to make sure the experiment is fair to ensure accurate results. ...read more.

Conclusion

Wear a lab coat so that it may be removed, without problem, if chemicals spill onto it. Plastic gloves should be worn to prevent chemical contact with skin. Also, when handling Bunsen burners, care should be taken. Copper (I) oxide (Cu2O) - may be harmful if swallowed or if inhaled, could irritate lungs. If in contact with eye, rinse thoroughly with water for 15 mins and seek medical attention if problem persists. If in contact with skin, rinse with soap and water, and if swallowed in reasonable quantity, seek medical attention Copper (II) Oxide (CuO) - Causes eye irritation, can damage cornea. Flush eyes with water for 15 mins. Irritates skin and can discolour it. If contact should occur, wash skin with soap and water. If swallowed, can cause damage to kidneys and liver. May also cause vascular collapse. However, do not induce vomiting, but drink cupfuls of milk. Id breathing is difficult do not give mouth to mouth resuscitation Copper Carbonate (CuCO3) - risks are similar, yet not so hazardous. However treat with similar care. ...read more.

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