Write equations for the half-reactions that occur in the electrol...

Question

Write equations for the half-reactions that occur in the electrolysis of a mixture of molten potassium bromide and molten lithium bromide.

Accepted Answer

Identify the ions present in the molten mixture: Potassium bromide (KBr) dissociates into K⁺ and Br⁻ ions, while lithium bromide (LiBr) dissociates into Li⁺ and Br⁻ ions.. Determine the possible half-reactions at the cathode: At the cathode, reduction occurs. The possible reduction reactions are K⁺ + e⁻ → K and Li⁺ + e⁻ → Li.. Determine the possible half-reactions at the anode: At the anode, oxidation occurs. The possible oxidation reaction is 2Br⁻ → Br₂ + 2e⁻.. Consider the standard reduction potentials: Potassium and lithium have very negative standard reduction potentials, indicating they are strong reducing agents. Bromine has a more positive potential, making it more likely to be oxidized.. Write the half-reactions: Based on the reduction potentials, the half-reaction at the cathode is likely to be Li⁺ + e⁻ → Li, and at the anode, it is 2Br⁻ → Br₂ + 2e⁻.