Copper can reduce zinc ions if the resultant copper ions can be kept at a sufficiently low concentration by the formation of an insoluble salt. What is the maximum concentration of `Cu^(2+)` in solution if this reaction is to occur, when `Zn^(2+)` is 1 molar?

Explanation

`Cu,Cu^(2+)||Zn^(2+), Zn, E_(cell)=E_(red)(Zn)-E_(red)(Cu)=0]` `6 times 10^-38 M`