Chapter 5, Problem 109RQ

In Problem 5-108, were all of the experiments described actually necessary to establish the order?

The following chemical reactions are observed to occur in aqueous solution.

$\begin{array}{l}{\text{2Al + 3Cu}}^{\text{2+}}\stackrel{}{\to }{\text{ 2Al}}^{\text{3+}}\text{+ 3Cu}\hfill \\ {\text{2Al + 3Fe}}^{\text{2+}}\stackrel{}{\to }{\text{ 3Fe + 2Al}}^{\text{3+}}\hfill \\ {\text{Pb}}^{\text{2+}}\text{+ Fe }\stackrel{}{\to }{\text{Pb + Fe}}^{\text{2+}}\hfill \\ {\text{Fe + Cu}}^{\text{2+}}\stackrel{}{\to }{\text{Fe}}^{\text{2+}}\text{+ Cu}\hfill \\ {\text{2A1 + 3Pb}}^{\text{2+}}\stackrel{}{\to }{\text{3Pb + 2Al}}^{\text{3+}}\hfill \\ {\text{Pb + Cu}}^{\text{2+}}\stackrel{}{\to }{\text{Pb}}^{\text{2+}}\text{+ Cu}\hfill \end{array}$

Arrange the metals $\text{Al, Pb, Fe, and Cu}$ in order of increasing ease of oxidation without referring to Table 5.3.