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Investigating the laboratory preparation of pure metal.

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Investigating the laboratory preparation of pure metal Introduction. Malachite, a very popular semi-precious gemstone, is a secondary mineral of copper. It has a characteristic green colour with light green streaks, and is normally opaque. Its hardness varies from 3.5 to 4.0 on the Mohs scale. As a decorative stone, malachite was widely used, especially in Tsarist Russia; the Hermitage museum in St Petersburg contains numerous malachite artefacts (including the famous Malachite Room); and the columns of St Isaac's cathedral in the city were carved from the stone Electrolysis Electrolysis is a process by which electrons are forced through a chemical cell, thus causing a chemical reaction. The positive change usually attracts electrons, and the electrode providing electrons is called cathode, because reduction takes place on it. Positive ions (cations) are attracted to the positive electrode (cathode). Negative ions (anions) ...read more.


I will weigh the carbon electrodes. These will be placed in the solution of copper sulphate in the beaker and connected to an electrical circuit in the experiment, which was connected to the power supply. I will set the power supply to 2 volts and pass the current through the solution for 20 min. Then I will turn of the power and remove the carbon electrodes and weigh them. I will calculate the amount of copper that has been formed on the electrode. I will do this experiment for 3 times, when I get the results from the experiment then I will record it in table. I will calculate the yield of the malachite for each result. To calculate the yield I will use this formula: %Yield = Carbon after-Carbon before Malachite CuCo3+H2So4 CuSo4+H2o+Co2 Results Results Trail Malachite (g) ...read more.


My results suggest that if the copper I got on the rod is greater then the percentage yield will be greater as well. The rods weigh less when there is no copper on it but weigh more when it has copper on it. Evaluation The aim of the experiment was produce pure metal in the laboratory. My results show that my experiment was correct but not accurate. There are many reasons why the experiment was not 100% accurate. One of the reasons of not getting the accurate results is that I might have measured the rods and the malachite incorrectly. I might have had the wrong voltage through the solution. The copper on the cathode might have been dropped when I was trying to measure the amount of copper on the rods. The results were not accurate because the colour of the solution didn't change from blue, which means that not all the copper went to the cathode. ...read more.

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