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Electrochemistry Electrolysis of Aqueous Salts • What products are formed at a) the anode and b) the cathode when concentrated aqueous potassium bromide is electrolysed a) At the anode (+ve): Negatively charged bromide ions and hydroxide ions (anions) are both attracted to the positive anode. At high concentration, bromide ions are preferentially oxidised to molecular bromine at the anode: 2Br−(aq) → Br2(aq) + 2e− using inert 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)PDF Image | Electrolysis of Aqueous Salts
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