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Electrochemistry Electrolysis of Aqueous Salts • What products are formed at a) the anode and b) the cathode when aqueous silver nitrate is electrolysed using inert electrodes? a) At the anode (+ve): Negatively charged nitrate ions and hydroxide ions (anions) are both attracted to the positive anode. Regardless of concentration, nitrate 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− b) At the cathode (–ve): Positively charged silver ions and hydrogen ions (cations) are both attracted to the negative cathode. Silver is below hydrogen in the electrochemical series, therefore silver ions are preferentially reduced to silver atoms at the cathode: Ag+(aq) + e− → Ag(s)PDF Image | Electrolysis of Aqueous Salts
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