Describe how the application of a potential more negative that the equilibrium potential can facilitate the reduction of Cu$2+$ at a carbon electrode immersed in in an electrolyte. Use an appropriate diagram in your answer.

A solution consists of $1\mathrm{.}0$ M Co$($NO$3)2$ and $1\mathrm{.}0$ M Cu$($NO$3)2.$ Eo Co$2+/$Co $=0\mathrm{.}28$ V $($vs SHE$)$

Eo Cu$2+/$Cu $=+0\mathrm{.}34$ V $($vs SHE$)$

R $=8\mathrm{.}3143$ J K$1$ mol$1,$ F $=98485$ C mol$1$

$($ii$)$ In a cathodic deposition experiment at $298$ K$,$ which species, Co$2+$ or Cu$2+,$ would

you expect to deposit first? Explain your answer.

$($iii$)$ What potential range would you use to separate the Cu$2+$ from the Co$2+?$

$($iv$)$ Using an appropriate calculation, show that it is indeed possible to separate the Co$2+$ from the Cu$2+.$