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# Which Equation is Correct

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Introduction

Which Equation is Correct? In this investigation, I am going to plan an experiment to determine the correct equation for the decomposition of basic copper carbonate. Basic copper carbonate is a mixture of 60% CuCO3 and 40% Cu(OH)21. It has two oxides, Cu2O and CuO. When it is heated, basic copper carbonate decomposes to form one of its oxides. The gases produced during the decomposition come from the CuCO3. The equation for possible reactions can be either of the following: Equation 1: 2CuCO3(s) Cu2O(s) + 2CO2(g) + 1/2O2(g) Equation 2: CuCO3(s) CuO(s) + CO2(g) To determine which of these 2 equations are correct, I will be decomposing 0.4g (to nearest 0.01g) of basic copper carbonate. My predictions for both of the equations are below: Equation 1: Ratio of - 2CuCO3 : 2CO2 + 1/2 O2 1 : 1.25 Mass of 1 mole of CuCO3 = 123.52 g Mass of Copper Carbonate used = 0.4g Moles of 2CuCO3 = 0.4 � 123.5 = 0.003 moles As the ratio is 1: 1.25, so Moles of Gas given off = 0.003 � 1.25 = 0.0037 moles At room temperature (20�c) ...read more.

Middle

This is vital because change in the temperature and pressure will affect the volume of gas given off. First I will put the weighing boat on the digital balance and set the display to zero. Then using a spatula I will carefully add some amount of copper carbonate and weigh 0.4g (to the nearest 0.01g) of it. I will then carefully transfer the copper carbonate from the weighing boat to the test tube. After that, I will put the bung with delivery tube on the test tube and connect the other end of the delivery tube to the 100cm3 gas syringe and make sure the gas syringe is set to zero so correct readings can be taken. To heat the copper carbonate, I will use a Bunsen burner and I will set the air vent to half open. I will do this to ensure that the copper carbonate is heated at a constant medium heat to ensure that all of it is heated. I will also heat from below and all the sides so all of it is decomposed3(turns black), so that the maximum ...read more.

Conclusion

If you burn your skin, call for medical help immediately. * Keep work place tidy and stools under the desk to avoid any accidents. I have used the following two sources of information for my plan. 1) I used (http://ptcl.chem.ox.ac.uk/~hmc/hsci/chemicals/copper_II_carbonate.html) this source as it gives out all the information about copper carbonate and its hazards. This site is very reliable as it's from the University of Oxford. 2) (Chemistry 1 Text Book) I used this to get the information about the oxides of copper carbonate. This source is very reliable as it's a published book by Cambridge University Press and is endorsed by OCR itself. 3) (http://en.wikipedia.org/wiki/Copper(II)_carbonate) I used this site to obtain the relative atomic mass for copper carbonate. This site is very reliable as it's a global and most widely used encyclopaedia in the world. 4) (HazCards) I used the hazard cards to get information about health and safety precautions on copper carbonate. This source is reliable as the hazard cards are made by a professional company and are used by the college science department. 1 http://www.pcl.ox.ac.uk/MSDS/CO/copper_II_carbonate.html 2 http://en.wikipedia.org/wiki/Copper(II)_carbonate 3 Chemistry 1 Text Book (Page 188) 4 http://ptcl.chem.ox.ac.uk/~hmc/hsci/chemicals/copper_II_carbonate.html 5 Hazcards ?? ?? ?? ?? ...read more.

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