Preferential discharge of cations during electrolysis

Electrolysis of copper sulfate solution in a laboratory setting, with visible copper

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Use this practical to show that metal cations are preferentially discharged, in relation to the metal’s position in the reactivity series. Includes kit list and safety instructions.

In this experiment, students electrolyse copper(II) sulfate, iron(II) sulfate and zinc sulfate solutions, before testing for any metal deposited at the electrodes.

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