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In the Castner–Kellner process used to manufacture sodium hydroxide, which statement is correct?

1. Brine is electrolyzed with platinum electrodes
2. Brine is electrolyzed with graphite electrodes
3. Molten sodium chloride is electrolyzed
4. Sodium amalgam is produced at the mercury cathode

Correct answer: Sodium amalgam is produced at the mercury cathode

Solution

In the Castner–Kellner process, sodium ions are reduced at the mercury cathode to form sodium amalgam, which is a key step in producing sodium hydroxide from brine.

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