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Electrochemistry Electrolysis of Aqueous Salts • What products are formed at a) the anode and b) the cathode when dilute aqueous potassium bromide is electrolysed using inert a) At the anode (+ve): Negatively charged bromide 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− electrodes? b) At the cathode (–ve): Positively charged potassium ions and hydrogen ions (cations) are both attracted to the negative cathode. Potassium is above hydrogen in the electrochemical series, therefore hydrogen ions are preferentially reduced to molecular hydrogen at the cathode: 2H+(aq) + 2e− → H2(g) Becomes concentrated potassium bromide – KBr(aq)PDF Image | Electrolysis of Aqueous Salts
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