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Electrochemistry Electrolysis of Aqueous Salts • What products are formed at a) the anode and b) the cathode when aqueous copper(II) sulfate is electrolysed using inert a) At the anode (+ve): Negatively charged sulfate ions and hydroxide ions (anions) are both attracted to the positive anode. Regardless of concentration, sulfate ions are not oxidised during electrolysis. Consequently, hydroxide ions are preferentially oxidised to molecular oxygen and water at the anode: 4OH−(aq) → O2(g) + 2H2O(l) + 4e− 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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