Here's why:
* Activity Series: Iron is less reactive than aluminum. This means that iron cannot displace aluminum from its salt solution. The activity series of metals helps predict whether a single displacement reaction will occur.
* No Redox Potential: The reaction would require a change in oxidation states, but there's no favorable driving force for this to occur. Iron would need to oxidize (lose electrons) and aluminum would need to reduce (gain electrons), but the relative reactivity of the metals makes this unfavorable.
In summary: Iron metal will not react with aluminum sulfate solution.
