6.2 Changes at the electrodes
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What happens to ions during electrolysis
• positive ions move towards the cathode, gain electrons, reduction • negative ions move towards the anode, lose electrons, oxidiation
What solution does salt have when it dissolves in water and what happens to the ions
brine/ sodium chloride solution • Sodium ions and chloride ions split up • Na+ ions and Cl- ions • Water molecules also split up • H+ ions and OH- ions It produces hydrogen, chlorine and sodium hydroxide
How does water affect the products of electrolysis
When electrolysis happens in aqueous solution, the less reactive element is usually produced at the cathode At the anode oxygen is given off from discharged hydroxide ions produced from water a halogen is produced if the electrolyte is a soultion of a halide
Whats the easiest to discharge at the anode
halide ion