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Copper carbonate decomposition

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Emma Miller Chemistry Coursework Copper has two oxides, Cu O and CuO Copper carbonate, CuCO decomposes on heating to form one of these oxides and an equation can be written for each possible reaction: Equation 1: 2CuCO (s) Cu O(s) + 2CO (g) + 1/2 O (g) Equation 2: CuCO (s) CuO (s) + CO (g) My aim for this experiment is to find out which equation is correct, I will use my knowledge of the relationship between the mole and the volume to prove which equation is correct. In order to do this I will have to measure the volume of gas evolved from the two experiments. To begin my experiment I need to know how much (the mass) of copper carbonate I am going to use for each equation so that enough gas evolves to be easily calculated and so that my test is fair. To work out the mass firstly we need to find out the empirical formula, which is the ratio of the number of atoms of each element in the compound. 1. 2CuCO (s) Cu O(s) + 2CO (g) + 1/2 O (g) Ratio of moles: - 2 moles : 2 1/2 Smallest ratio:- 1 mole : 1 1/4 2. CuCO (s) CuO (s) + CO (g) ...read more.


= 123.5 Mr 1.664 x 10 3 = Mass 123.5 Rearrange the equation to get what the mass equals: Mass = Mr x Moles = 123.5 x 1.664 x 10 -3 = 0.205 Therefore 0.205g of Copper Carbonate is needed to decompose to produce 50cm of gas. 2. 'Chemistry 1 endorsed by OCR For equation 2: 2CuCO3 Cu2O + 2CO2 + 1/2 O2 Ratio: 1 : 1 Moles: 1.664 x 10 3 : 1.664 x 10 3 Therefore if I want to use 0.205g then the amount of gas that should evolve if equation 2 is correct is:- Vol = mol x 24000 = 1.664 x 10 3 x 24000 = 39.94 In order for me to carry out this experiment, I will need suitable apparatus:- 1. 5 large boiling tubes 2. Bunsen Burner 3. Clamp 4. Bung 5. Delivery tube 6. Piece of rubber tubing can be used to connect the glass tubing to a gas syringe 7. Gas syringe 8. Stand 9. Accurate weighing scales capable of measuring to 0.01 of a mole 10. Safety goggles 11. Laboratory coat The method I will use is as follows:- 1. Set up the equipment as shown in the diagram below, making sure that there are no other chemicals in any of the equipment and also that the gas syringe is fully pressed in 2. ...read more.


- Labelled as harmful if swallowed and also the dust irritates both lungs and eyes Follow standard Laboratory safety rules. I will make my test fair by taking the following precautions:- 1. I will make certain that the gas syringe is at 0 before beginning the experiment. 2. I will ensure that all the copper carbonate has been fully decomposed by waiting until the copper carbonate, which is a green colour, has changed fully to a black colour which is the colour of copper oxide. Another way of knowing whether the reaction has stopped is when no more gas is being evolved. 3. I will also wait about a minute before taking a result while the copper oxide cools and all the gas has been released while the copper carbonate decomposes. 4. I will allow the gases to cool to room temperature before taking a reading because when heated, gases tend to expand, which may affect my results. For every reading taken I will wait 3 minutes which is a reasonable time because it ensures accuracy and will not be too time consuming. 5. I could also repeat the experiments 3-4 times to obtain an accurate average, this would minimise the risk of errors and it would also account for any anomalous results. 6. When taking my readings I will measure to 2 decimal places to ensure a high level of accuracy. ...read more.

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