During the electrolysis of molten potassium iodide, potassium ions move to the c

Question

During the electrolysis of molten potassium iodide, potassium ions move to the cathode, which is positively charged to the anode, which is positively charged to the anode, which is negatively charged to the cathode, which is negatively charged through the wire to the battery A voltaic cell is constructed with one cell consisting of a Cd electrode in 1.0 M Cd^2+ and another cell with a Cr electrode in 1.0 M Cr^3+. Which of the following represents the reaction that occurs at the negative electrode of this cell? Cd rightarrow Cd^2+ 2e^- Cr^3+ rightarrow Cr^4+ + 3^- Cr rightarrow Cr^3+ + 3e^- Cr^3+ + 3e^- rightarrow Cr Cd^2+ + 2e^- rightarrow Cd

Explanation / Answer

2. d. to the cathode, which is negatively charged. (Potassium ion is K+, cation which is positivley charged, so it will go to negatively charged cathode.)

3. e. Cd2+ + 2e- ----> Cd (Cd+2 + 2e- ---> Cd, Ered = -0.40 V, Cr+3 + 3e- ----> Cr, Ered = -0.74. So Cd+2 is more easily reduced than Cr+3).

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