Electrolysis: purifying copper
Lesson 4 / 10
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I can investigate what happens when a solution of copper sulfate is electrolysed with copper electrodes.
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Purification of copper involves using copper electrodes in an electrolyte.
The electrolyte must contain the same ions, in solution, as the metal being purified by electrolysis.
Measuring the mass change in the copper electrodes demonstrates the transfer of copper.
Impurities in the anode do not transfer to the cathode, leading to pure copper deposition.
Other uses for this technique include electroplating, where you would use multiple metals e.g. gold.
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