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Electrochemistry Electrolysis using Active Electrodes • What products are formed at a) the anode and b) the cathode when aqueous silver nitrate is electrolysed using silver electrodes? a) At the anode (+ve): If the anode is made of a metal whose cations also exist in the electrolyte, then the anode is described as being active, i.e. it will participate in the electrolysis and undergo oxidation. In this example, the silver atoms of the anode will be oxidised to form silver ions: Ag(s) → Ag+(aq) + e− 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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