Lab 7 Electrochemistry

Lab 7 Electrochemistry - Chem 125 Name Dr Nguyen Partner...

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Chem 125 Dr. Nguyen Name: Roman Ferro Partner : Kwaku Farkye Partner : Electrochemistry Instructions: Each person is to submit an individual report, due a week after the experiment is done . You must turn in a typed hard copy of this report. ( Total = 4 pts of pre-lab + 21 pts of report = 25 pts ) Part 1: Corrosion (4 pts) Record your results based on what you observed in this part in the table below. Answer the questions as asked. Also write out the anodic and cathodic reactions for for what’s occurring in each case. Draw your observations, or paste in photos, of color changes on the next page, for each nail and metal combo. Nail description Did you see blue? What metal is the Anode? What metal is the Cathode? Half-Cell Reactions Plain Nail Yes Iron Iron Fe(s) ↔ Fe2+ + 2e- Fe2+ + 2e- ↔ Fe(s) Nail piercing Zinc No Zinc Iron Fe2+ + 2e- ↔ Fe(s) Zn(s) ↔ Zn2+ + 2e- Nail + Cu wire Yes Iron Copper Fe(s) ↔ Fe2+ + 2e- Cu2+ + 2e- ↔ Cu(s) Nail + Cu + Mg No Iron Cu and Mg Fe(s) ↔ Fe2+ + 2e-
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Chem 125 Dr. Nguyen Cu2+ + 2e- ↔ Cu(s) Mg2+ + 2e- ↔ Mg(s) Scored Nail Yes Iron Iron Fe(s) ↔ Fe2+ + 2e- Fe2+ + 2e- ↔ Fe(s) Nail + Al No Al Iron Fe2+ + 2e- ↔ Fe(s) Al(s) ↔ Fe3+ + 3e-
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Chem 125 Dr. Nguyen (1 pt) In which of the reactions in this part are the iron nails undergoing corrosion? List the cases in which you observe corrosion of the nail and tell me HOW you know the nail itself is corroding. The iron nail is undergoing corrosion in the cases when it has nothing done to it, when it is scored, when it has copper wire on it, and when it has copper wire along with magnesium on it. We can tell that it is being corroded because of the presence the color blue. When blue is present, we know that Fe2+ is formed and Fe acts as the reducing agent through the equation
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This note was uploaded on 11/14/2011 for the course CHEM 125 taught by Professor Retsek during the Fall '08 term at Cal Poly.

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Lab 7 Electrochemistry - Chem 125 Name Dr Nguyen Partner...

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