Laboratory Activity 6.3.1: Positions of ions in the electrochemical series |
Problem statement: How does the position of ions in the electrochemical series influence the choice of ion for discharge?
Hypothesis: Ion located at the lower position in the electrochemical series will be preferably discharged at the electrode.
Variable:
» | Fixed variable : Concentration of electrolytes and types of electrodes | |
» | Manipulated variable : Position of ions in the electrochemical series | |
» | Responding variable : Types of ions discharged at the anode and the cathode |
Material: » Dilute sulphuric acid » Copper(II) sulphate solution |
Apparatus: » Electrolytic cell » Test tube » Carbon electrodes » Switch » Connecting wires » Crocodile clip » Wooden splinter » Batteries |
► | The animation below shows the arrangement and results of the experiment.
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► | Dilute sulphuric acid
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► | Copper(II) sulphate solution
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► | Dilute sulphuric acid
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► | Copper(II) sulphate solution
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► | The position of ions in the electrochemical series influences the ions selected for discharge at the electrodes. Thus, the electrolysis of
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► | The hypothesis is accepted. |
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