Chemistry Laboratory Experiment

5. One metal was upstage and a new one inserted, and the procedure reiterate.

6. This step was repeated until all possible pairs had been measured.

1. Ranking of relative reduction potentials for the metals apply:

2. The further the two metals are apart in the rankings, the greater the potential difference between them; the closer they are in the rankings, the smaller the potential difference between them.

3. Reduction potentials for the metals use from Appendix E were:

Eocell = Eored(cathode) - Eored(anode)

Al + Cu Eocell = -1.66 - 0.34 = -2.00

Al + Pb " = -1.66 - (-0.13) = -1.53

Al + Sn " = -1.66 - (-0.14) = -1.52

Al + Fe " = -1.66 - (-0.44) = -1.22

Al + Mg " = -1.66 - (-2.37) = +0.71

Cu + Pb " = +0.34 - (-0.13) = +0.47

Cu + Sn " = +0.34 - (-0.14) = +0.

48

Cu + Ni " = +0.34 - (-0.25) = +0.59

Cu + Fe " = +0.34 - (-0.44) = +0.78

Cu + Zn " = +0.34 - (-0.76) = +1.10

Cu + Mg " = +0.34 - (-2.37) = +2.71

Fe + Pb " = -0.44 - (-0.13) = -0.31

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