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NCSU CH 101 - lecture 31 notes

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Slide 1Q31-1: What is the anode ½ reaction?Q31-2: What is the cathode ½ reaction?Q31-3: What is the net redox reaction?Slide 5Slide 61Lecture 31 Objectives:30d. (continued). Components of galvanic cell.31a. Write net redox reactions.a. Describe the process used to identify a spontaneous redox reaction and write the net reaction.Step 1: Look up the reactions in Reduction Table. List them with most negative on top, and most positive on bottom.Step 2: The anode is always on the top (most -). The cathode is always on the bottom (most +).Step 3: E°cell = E°cat - E°anStep 4: The bottom reaction can be left alone, because reduction occurs at the cathode. The top reaction must be reversed, because oxidation occurs at the anode. Step 5: Add the two ½ rxns together in such a way that the electrons cancel out. This is the net redox reaction. Step 6: The number of electrons needed on each side to balance the redox reaction is the number of electrons transferred. Step 7: Put the ½ reactions with a picture of a battery. Step 8: The salt bridge cations always migrate to the cat. The salt bridge anions always migrate to the an.Step 9: The cathode electrode usually grows. The anode electrode usually shrinks.Step 10: The cathode compartment decreases in redox ion. The anode compartment increases in redox ion.Q31-1: What is the anode ½ reaction?Construct a Galvanic cell using Ag1+/Ag and Cr3+/ CrA. Ag 1+ + 1e-  AgB. Ag  Ag1+ + 1e-C. Cr 3+ + 3e-  CrD. Cr  Cr3+ + 3e-Cr3+ (aq) + 3e- Cr(s) -0.74 VAg1+ (aq) + 1e- Ag(s) +0.80 V2Q31-2: What is the cathode ½ reaction?Construct a Galvanic cell using Ag1+/Ag and Cr3+/ CrA. Ag 1+ + 1e-  AgB. Ag  Ag1+ + 1e-C. Cr 3+ + 3e-  CrD. Cr  Cr3+ + 3e-3Q31-3: What is the net redox reaction?Construct a Galvanic cell using Ag1+/Ag and Cr3+/ CrA. Ag 1+ + Cr  Ag + Cr 3+B. Ag + Cr 3+  Ag 1+ + CrC. 3Ag 1+ + Cr  3Ag + Cr 3+D. 3Ag 1+ + Cr 3+  3Ag + Cr4Q31-4: Which compartment is the cathode?How many electrons are transferred?Which way to the electrons travel?Construct a Galvanic cell using Ag1+/Ag and Cr3+/ CrA+-A. A, 6, leftB. A, 3, leftC. B, 6, rightD. B, 3, rightB5Q31-5: Which way do the anions in the salt bridge migrate? Which solution becomes more concentrated in ions as the reaction progresses?Construct a Galvanic cell using Ag1+/Ag and Cr3+/ CrA+-BA. Toward A, AB. Toward A, BC. Toward B, AD. Toward B,


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