- in electrolysis, the ions move towards the oppositely charged electrodes
- at the negative electrode (cathode) positive ions gain electrons, so they are reduced
- at the positive electrode (anode) negative ions lose electrons, so they are oxidised
- when electrolysis happens in aqueous solution, the less reactive element, either hydrogen or the metal is usually produced at the cathode
- at the anode you get either:
oxygen gas given off from discharged hydroxide ions produced from water
a halogen produced if the electrolyte is a solution of a halide
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