Which ion reduces at the cathode during electrolysis of fresh brine solution?
-
A.
Cl⁻
-
B.
H+
-
C.
OH⁻
-
D.
Na+
Correct Answer:
B. H+
Explanation:
During the electrolysis of a fresh brine solution (aqueous sodium chloride), the solution contains Na+, Cl-, H+, and OH- ions. At the negative cathode, H+ ions are more easily reduced than Na+ ions because hydrogen has a lower reduction potential. Consequently, H+ ions gain electrons to form hydrogen gas, while the sodium ions remain in the solution.
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