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Electrochemistry Electrolysis using Active Electrodes • What products are formed at a) the anode and b) the cathode when aqueous copper(II) sulfate is electrolysed using copper a) At the anode (+ve): If the anode is made of a metal whose cations also exist in the electrolyte, then the anode is described as being active, i.e. it will participate in the electrolysis and undergo oxidation. In this example, the copper atoms of the anode will be oxidised to form copper(II) ions: Cu(s) → Cu2+(aq) + 2e− electrodes? b) At the cathode (–ve): Positively charged copper(II) ions and hydrogen ions (cations) are both attracted to the negative cathode. Copper is below hydrogen in the electrochemical series, therefore copper(II) ions are preferentially reduced to copper atoms at the cathode: Cu2+(aq) + 2e− → Cu(s)PDF Image | Electrolysis of Aqueous Salts
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