A student sets up a copper half-cell consisting of a pure copper electrode immersed in an aqueous solution of copper(II) sulfate. Which change to this half-cell has no effect on its electrode potential?
Adding a small volume of concentrated aqueous ammonia to the copper(II) sulfate solution.
Replacing the single copper plate electrode with copper turnings of a much greater surface area but equal total mass.
Diluting the copper(II) sulfate solution with distilled water.
Decreasing the temperature of the half-cell.
