Chemistry Required Practical: Electrolysis

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  • Created on: 19-03-19 11:23
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  • Chemistry Required Practical: Electrolysis
    • 1. Pour Copper (II) Chloride solution into the beaker to about 50cm cubed.
      • 2. Add the lid and insert Carbon rods through the holes. The rods must not touch each other. Attach crocodile leads to the rods. Connect the rods to the DC (red and black) terminals of a low voltage power supply.
        • 3. Select 4 V on the power supply and switch on.
          • 4. Look at both electrodes. Is there bubbling at neither, one or both electrodes?
            • 5. Use tweezers to hold a piece of blue litmus paper in the solution next to the positive electrode (the one connected to the red terminal).  You will need to lift the lid temporarily to do this. Write down your observations.
              • 6.After no more than five minutes, switch off the power supply. Examine the negative electrode (the one connected to the black terminal). Is there evidence of a metal coating on it? Write down your observations.
                • 7. Clean the equipment carefully.  Repeat steps 1 - 6 using solutions of: Copper (II) Sulphate, Sodium Chloride and Sodium Sulphate.
    • Wear eye protection at all times.
      • Do not have a potential difference of higher than 4V - too much Chlorine will be made.
        • Do not run the electrolysis for more than 5 minutes, too much Chlorine will be made.
          • Chlorine is produced in the experiment, do not inhale it! Chlorine gas reacts with water in the lungs and produces Hydrochloric acid which then damages tissue in the lungs.
    • Don't let the electrodes touch you. You will create a circuit and no products will be formed.
      • Make sure you use a D.C. power supply.

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