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Electrochemistry Electrolysis of Acids and Alkalis • What products are formed at a) the anode and b) the cathode when dilute hydrochloric acid is electrolysed using inert electrodes? a) At the anode (+ve): Negatively charged chloride ions and hydroxide ions (anions) are both attracted to the positive anode. Because the solution is dilute, hydroxide ions are preferentially oxidised to molecular oxygen and water at the anode: 4OH−(aq) → O2(g) + 2H2O(l) + 4e− b) At the cathode (–ve): Hydrogen ions are the only cations present in the solution. Positively charged hydrogen ions are attracted towards the negatively charged cathode where they are reduced to molecular hydrogen: 2H+(aq) + 2e− → H2(g)PDF Image | Electrolysis of Aqueous Salts
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