• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Determine the Decomposition of Copper Carbonate

Extracts from this document...


Planning Introduction I'm going to produce a piece of coursework, which determine the Decomposition of Copper Carbonate The purpose of decomposing CuCO3 is to determine the volume of CO2 gas that evolves. In this experiment, the water displacement method is used to recover the gas evolved. The volume of CO2 collected is converted to dry conditions, which is then compared to the theoretical volume calculated. As copper has two oxides Cu2O and CuO, when copper carbonate (CuCO3) decomposes on heating to form one of these oxides and an equation can be written for each possible reaction: Equation 1: 2CuCO3(s) ------> Cu2O(s) + 2CO2 (g) + 1/2O2 Equation 2: CuCO3(s) --------->CuO(s) + CO2 (g) My aim is to find out which of these equations is correct. Hypothesis I predict that the CuO compound will be formed, because this is in line with the pilot results, and would be supported by the background theory. Copper most commonly forms compounds as a divalent ion, so I think that the thermal decomposition will be no exception and the oxide will be CuO. The kinetic stability and the stability of CuO with respect to Cu2O could account for the fact that Cu2O is energetically more stable with respect to its elements. ...read more.


Further information about the method? 1) This experiment requires measuring the temperature inside the boiling tube, which is difficult using standard laboratory equipment. 2) Instead a "control" experiment could be set up, in which no copper carbonate is used, but an empty boiling tube is heated for the same length of time, and the volume of the gas collected due to expansion of the air measured. This volume could then be subtracted from the volume obtained by the decomposition of the copper carbonate to give a more accurate result for the volume of gas given off. 3) It will be necessary to keep the size of the boiling tube constant because the extra volume given out by the expansion of the hot air will be different depending on the size of the test tube. 4) We should Use the same boiling tube and bung for each repeat. Calculations of results: 1. Write the balanced chemical equation for the decomposition of copper (II) carbonate. 2. Using Dalton's Law of Partial Pressures, determine the pressure of the carbon dioxide gas. 3. using mass to mole stoichiometry, determine the moles of carbon dioxide expected from this reaction. ...read more.


* any splashes into the eye must be washed out continuously for 10-15 minutes * Before starting the experiment we must make sure to wear safety goggles and an apron in the lab at all times. Do not ingest chemicals. Use caution around open flames. Finnal Calculations: Equation 1: 2CuCO3(s) ------> Cu2O(s) + 2CO2g) + 1/2O2 As i have used 0.2g of CuCO3 I have to find its amount of moles by the formula of So 0.2/123.5 = 0.001619 mol If CuCO3 is 0.001619 mol then 2CO2 is 0.001619 mol as well. Then to get the volume of gas we multiply 0.001619 moles with 24000 which we get 38.86 cm3, If CuCO3 is 0.001619 mol then 1/2 O2 is 1/2 * 0.001619 / 2 = 0.000405 moles. 0.000405 moles * 24000 = 9.72 cm3 2CO2 (38.86 cm3) + 1/2 O2 (9.72 cm3) = 48.58 cm3 Equation 2: CuCO3(s) --------->CuO(s) + CO2 (g) 0.2 /123.5= 0.001619mol 24000* 0.001619mol = 38.86 cm3 of CO2 If the original volume that is obtained after the experiment is performed is close to either of this two volumes then that is the correct equation, Equation 1: = 48.58 cm3 Equation 2: = 38.86 cm3 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. CuCO3(s) CuO + CO2(g)2. or CuCO3(s) Cu2O(s) + O(g) This experiment ...

    So if you used 1g of 2CuCO3 you carry out the calculations in the same way... 1. 1g 247gmol-1 = 4.048x10-3moles 2. 4.048x10-3mols x 1.25 1 = 5.06x10-3moles 3. 5.06x10-3mols x 48dm3 = 0.243dm3 4.

  2. Experiment: To determine the correct equation for the decomposition

    Using the second equation: CuCO3 (s) CuO (s) + CO2 (g) Molar ratio: 1 1 + 1 Using 1 gram of copper carbonate: Number of moles = Mass / Mr = 1 / 123.5 = 8.097 x 10� moles copper carbonate Because the molar ratio between the copper carbonate and

  1. An Experiment to Determine the Enthalpy Change for the Decomposition of Calcium Carbonate.

    1197 = 23940J / 23.94KJ 0.05 The answer will be negative because it is an exothermic experiment. Answer: �23.9KJ to 3 s.f Results from Route 2 CaO(s) + 2HCl(aq) CaCl2(aq) + CO2(g) + H2O(l) Mass of calcium oxide (CaO) used 2.8g Temperature of acid initially 22.1�C Temperature of acid after

  2. Application of Hess's Law

    Results NaHCO3 Na2CO3 Mass in grams Initial Temp. ?C Final Temp. ?C Difference ?C Mass in grams Initial Temp. ?C Final Temp. ?C Difference ?C 9.43g 23?C 15?C 8?C 6.32g 25?C 25.5?C 0.5?C 9.41g 25?C 15?C 10?C 6.38g 25?C 26.0?C 1.0?C 9.44g 24?C 14.5?C 10.5?C 6.33g 24.5?C 26.5?C 2.0?C To calculate the enthalpy I must assume that 1cm3

  1. How much Iron (II) in 100 grams of Spinach Oleracea?

    present in 100 cm3 of spinach extract solution. To do this the moles present in 5 cm3 will have to be multiplied by 20. 0.0000875 mol dm-3 X 20 = 0.00175 mol dm-3 Only 20 grams of Spinach Oleracea were used to make up the 100cm3 spinach extract solution, so in order to work out the moles of Iron (II)

  2. Copper carbonate decomposition

    'At room temperature, 25?C and atmospheric pressure at 1 atmosphere 1 mole of ant gas will occupy a volume of 24dm3.' 1. This is useful because we have to use this to work out how much gas should be evolved from a specific measurement.

  1. making copper

    Risk assessment Material Hazard What could go wrong? Safety precautions What to do in case of accident Risk:/medium/high Dilute sulphuric acid (1 mol dm-3) Very corrosive May burn you Wear eye protection and gloves. Drink 2 glasses of water and wash your mouth Low Dilute hydrochloric acid (2 mol dm-3)

  2. The aim of this experiment is to discover which of the following equations is ...

    Method To my knowledge there are only three possible ways to set out this experiment with the available equipment. Two of these methods are similar and both use water displacement while the other uses a syringe to collect the produced gas directly.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work