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Table 1. Table of Selected Standard Reduction Potentials at 25\'C Cell CuCu Redu

ID: 1027662 • Letter: T

Question

Table 1. Table of Selected Standard Reduction Potentials at 25'C Cell CuCu Reduction half-reactionStandard Reduction Potential cu" (aq)' + 2 e. Cu(s) E° = 0.342 V Fe2. (aq) + 2e' Fe(s) E°= -0447 V Zn2+ (aq) +2 e' Zn (s) E=-0.762V 1. When choosing between use as the cathode and which to use as the anode. two reduction half-reactions, explain how you decide which half-reaction to 2. Which would be the best Which of these half-reactions would be the best overall cathod overall anode? Explain your decision. e in this set? 3. Let's assume you've set up an electrochemical cell with the Cu /Cu half-reaction as t he cathode. Which of the other half-reactions can be the anode for a Cu Cu cathode? Do the anodes have more positive or more negative standard reduction potentials than the cathode? 4. Calculate Eo cel for the electrochemical cells involving the Cu /Cu half-reaction as the cathode and the possible anodes. cell Ecathode- E anode 5. What if Fe2'/Fe is the cathode- which cells can be the anode? Calculate E cen for the possible electrochemical cells t if Zn2 1Zn is the cathode - which cells can be the anode? What are Ecen for those possible electrochemical cells? Which electrochemical cell would produce the largest voltage? Identify your choice of the cathode cell and the anode cell. Write the overall reaction that takes place for the best electrochemical cell. What is the potential, lforthis cell? 7. 61

Explanation / Answer

Ans 1. Following points need to be remembered.

1. At anode , oxidation takes place and at cathode reduction takes place .

2. A high reduction potential means the chemical species have high tendency to get reduced at cathode .

3. Greater the reduction potential , smaller will be the oxidation potential and vice versa.

So , at cathode , we will use that half reaction , for which reduction potential is highest . And at anode , we will use that half cell , where reduction potential is lowest i.e. oxidation potential is highest .

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