Oxidation-Reduction Reactions A. Zn-Cu^+2 Reaction 1. Clean a Zn strip with sand
ID: 502457 • Letter: O
Question
Oxidation-Reduction Reactions A. Zn-Cu^+2 Reaction 1. Clean a Zn strip with sandpaper. 2. Place the strip in 100 mL beaker. 3. Measure 25 mL of 0.1M CuSO_4 and transfer it to the Zn beaker. 4. After 5 minutes, record your observations. B. Pb-Cu^+2 Reaction 5. Clean a Pb strip with sandpaper. 6. Place the strip in 100 mL beaker. 7. Measure 25 mL of 0.1M CuSO_4 and transfer it to the Pb beaker. 8. After 5 minutes, record your observations. c. Zn-Pb^+2 Reaction 9. Clean a Zn strip with sandpaper. 10. Place the strip in 100 mL beaker. 11. Measure 25 mL of 0.1M Pb(NO_3)_2 and transfer it to the Zn beaker. 12. After 5 minutes, record your observations.Explanation / Answer
Zn-Cu2+
The Zn strip turned black
Pb-Cu2+
The strip look rusted brown colour
Zn-Pb2+
the strip has black line in middle
Comment
oxidation half reaction Zn -----------> Zn2+ + 2e- Eooxidation +0.76V Reduction half reaction Cu2+ + 2e- ----------> Cu Eoreduction +0.34 V Net equation Zn + Cu2+ -----------> Zn2+ + Cu Eonet +1.1VRelated Questions
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