CHEM WET LAB 3.pdf - CHEM*1050 Experiment 3 Voltaic Cells...

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CHEM*1050 - Experiment 3: Voltaic Cells Part A. Qualitative Tests of Reducing Strengths of Zn, Pb, Cu and Fe Using the observations from below, arrange the four metals (not ions) in order of decreasing reducing strength. Give your reasoning which must follow the experimental results. Based on my observations, there were 6 reactions giving definite detectable observations: 1) Zn/Cu 2+ : Since Zn(s) can reduce Cu 2+ (aq) to Cu(s), Zn(s) has a greater reducing strength than Cu(s). 2) Zn/Pb 2+ : Since Zn(s) can reduce Pb 2+ (aq) to Pb(s), Zn(s) has a greater reducing strength than Pb(s). 3) Zn/Fe 2+ : Since Zn(s) can reduce Fe 2+ (aq) to Fe(s), Zn(s) has a greater reducing strength than Fe(s). 4) Pb/Cu 2+ : Since Pb(s) can reduce Cu 2+ (aq) to Cu(s), Pb(s) has a greater reducing strength than Cu(s). 5) Fe/Cu 2+ : Since Fe(s) can reduce Cu 2+ (aq) to Cu(s), Fe(s) has a greater reducing strength than Cu(s). 6) Fe/Pb 2+ : Since Fe(s) can reduce Pb 2+ (aq) to Pb(s), Fe(s) has a greater reducing strength than Pb(s). Zn has the highest reducing strength because it reduced all three of the ions (Cu 2+ , Pb 2+ and Fe 2+ ). Fe reduced the ions Cu 2+ and Pb 2+ , Pb only reduced Cu 2+ ions and Cu reduced none of the ions, becoming the metal with the lowest reducing strength. According to these observations, the order of decreasing reducing strength of these metals is: Zn(s) > Fe(s) > Pb(s) > Cu(s).
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