Laboratory Activity 6.3.2: Concentration of ions in electrolyte solution |
Problem statement: How does ion concentration influence the choice of ion for discharge?
Hypothesis: Ion that is more concentrated will be preferably discharged at the electrode.
Variable:
» | Fixed variable : Electrolyte and types of electrodes | |
» | Manipulated variable : Concentration of ions | |
» | Responding variable : Types of ions discharged at the anode and the cathode |
Material: » Potassium bromide solution 2 mole dm-3 and 0.001 mole dm-3 |
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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► | Potassium bromide solution 2 mole dm-3
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► | Dilute potassium bromide solution 0.001 mole dm-3
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► | Potassium bromide solution 2 mole dm-3
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► | Dilute potassium bromide solution 0.001 mole dm-3
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► | The more concentrated a type of ion in an aqueous solution, the more readily it is discharged during electrolysis. | |
► | The hypothesis is accepted. |
⇲ For exercise(objective and subjective), download for free on Android OS. | ||
I used this one exercise book and i have a question ,, if 0.001 mole of MgCl2solution , the product form at cathode is Hydrogen and when 2mole of MgCl2 solution is use why doesn't the Mg form at the cathode? Could any of these type of experiment,, the concentration of ion affect the product form at cathode?or maybe when using carbon rod only hydrogen can be form??
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