Open Question
Separate this redox reaction into its balanced component half-reactions. Cl2 + 2K
20. Electrochemistry
Electrolytic Cell
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What is produced at the cathode during the electrolysis of aqueous NaBr?
A
Hydrogen gas (H2)
B
Bromine gas (Br2)
C
Oxygen gas (O2)
D
Sodium metal (Na)
Verified step by step guidance1
Identify the components present in the aqueous solution of NaBr. The solution contains Na⁺ ions, Br⁻ ions, and water (H₂O).
Understand the process of electrolysis, which involves the movement of ions towards electrodes: cations move towards the cathode, and anions move towards the anode.
At the cathode, reduction occurs. Consider the possible reduction reactions: Na⁺ ions can be reduced to Na metal, and H₂O can be reduced to form H₂ gas.
Compare the standard reduction potentials of the possible reactions at the cathode. The reduction of H₂O to H₂ gas has a more favorable (less negative) reduction potential than the reduction of Na⁺ to Na metal.
Conclude that the more favorable reaction at the cathode is the reduction of water, leading to the production of hydrogen gas (H₂).
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