1. Electrochemical cell Lab May 29, 2009Your Full Name: Jessi Purpose:To draw and completely analyze five electrochemical cells. Procedure:As outlined by the instructor. Data:

2. 1. Cu, CuSO 4 || Zn, ZnSO 4

3. 1. Cu, CuSO 4 ll Zn, ZnSO 4 0.90 v Actual Voltage- different from theoretical

4. 1. Cu, CuSO 4 ll Zn, ZnSO 4 Cu Zn 0.90 v

5. 1. Cu, CuSO 4 ll Zn, ZnSO 4 Cu 2+ Cu Zn SO 4 2- CuSO 4(aq) 0.90 v

6. 1. Cu, CuSO 4 ll Zn, Zn(NO 3 ) 2 Cu 2+ Cu Zn Zn(NO 3 ) 2(aq) SO 4 2- Zn 2+ NO 3 - CuSO 4(aq) 0.90 v

7. 1. Cu, CuSO 4 ll Zn, ZnSO 4 0.90 v Cu 2+ Cu Zn Zn(NO 3 ) 2(aq) SO 4 2- Zn 2+ NO 3 - NaCl (aq) Na + Cl - CuSO 4(aq)

8. 1. Cu, CuSO 4 ll Zn, ZnSO 4 Cu 2+ Cu Zn Zn(NO 3 ) 2(aq) SO 4 2- Zn 2+ NO 3 - NaCl (aq) Na + Cl - CuSO 4(aq) 0.90 v

9. 1. Cu, CuSO 4 ll Zn, ZnSO 4 Cu 2+ Cu Zn Zn(NO 3 ) 2(aq) SO 4 2- Zn 2+ NO 3 - NaCl (aq) Na + Cl - CuSO 4(aq) Greatest Electron Affinity + Cathode Reduction Cu 2+ + 2e - → Cu (s) 0.34 v Gains mass 0.90 v

10. 1. Cu, CuSO 4 ll Zn, ZnSO 4 Salt Bridge: NaNO 3 Cu 2+ Cu Zn Zn(NO 3 ) 2(aq) SO 4 2- Zn 2+ NO 3 - NaNO 3(aq) Na + NO 3 - CuSO 4(aq) - Anode oxidation Zn (s) → Zn 2+ + 2e - +0.76 v Loses mass Greatest Electron Affinity + Cathode Reduction Cu 2+ + 2e - → Cu (s) 0.34 v Gains mass 2e - 0.90 v

11. 1. Cu, CuSO 4 ll Zn, ZnSO 4 Salt Bridge: NaNO 3 Cu 2+ Cu Zn Zn(NO 3 ) 2(aq) SO 4 2- Zn 2+ NO 3 - NaNO 3(aq) Na + NO 3- CuSO 4(aq) Greatest Electron Affinity + Cathode Reduction Cu 2+ + 2e - → Cu (s) 0.34 v Gains mass Overall Reaction: Cu 2+ + Zn (s) → Zn 2+ + Cu (s) 1.10 v 2e - - Anode oxidation Zn (s) → Zn 2+ + 2e - +0.76 v Loses mass 0.90 v

12. 2.Pb, Pb(NO 3 ) 2 ll Zn, Zn(NO 3 ) 2 Salt Bridge: NaNO 3 Actual Voltage 0.84 v

13. 3. Fe, Fe(NO 3 ) 2 ll Ni, Ni(NO 3 ) 2 Salt Bridge: NaNO 3 Actual Voltage 0.20 v

14. 4. Cu, CuSO 4 ll Fe, Fe(NO 3 ) 2 Salt Bridge: NaNO 3 Actual Voltage 0.74 v

15. 5. Ni, Ni(NO 3 ) 2 ll Zn, Zn(NO 3 ) 2 Salt Bridge: NaNO 3 Actual Voltage 1.00 v

16. Conclusion State that you did what you set out to do in the purpose. Do I need to say, do not use pronouns? Start with the main rule and describe how you would completely analyze an electrochemical cell- use your notes! Discuss how you determined the anode, cathode, site of oxidation, and site of reduction. Discuss electron flow and ion migration. Explain the function of the salt bridge and what is meant by electron affinity. How did the experimental and predicted voltages compare? What are electrochemical cells used for? Maybe you can think of another intelligent comment?