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