Question

Will aluminum oxidize `"cupric ion"`?

Answer 1

I think this is incorrect. Aluminum metal should reduce `Cu^(2+)` ion.

Explanation:

Aluminum metal is much more active than copper, and aluminum in copper sulfate should result in deposition of metallic copper:

`2Al(s) + 3Cu^(2+) rarr 2Al^(3+) + 3Cu(s)darr`

If you use aluminum foil, the foil should darken and slowly dissolve as the copper precipitates. The colour of the solution, initially a beautiful blue, should also go progressively pale.