CH-1740
Electrolysis of solutions
Chemistry · Secondary 4 · Medium · Electrolysis of solutions
A solution contains only sodium ions and sulfate ions. It is electrolysed using inert electrodes. Which ion is discharged at the cathode and what is the main product formed there?
Cathode reactions:
• Na"+" + e"−" → Na
• 2H₂O + 2e"−" → H₂ + 2OH"−"
Use the information to decide the correct cathode product.
Cathode reactions:
• Na"+" + e"−" → Na
• 2H₂O + 2e"−" → H₂ + 2OH"−"
Use the information to decide the correct cathode product.
- Na"+" is discharged to form sodium metal
- Na"+" is discharged to form sodium hydroxide
- Water is discharged to form hydrogen gas
- Water is discharged to form oxygen gas
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