$3.$ State Nernst$$s distribution law.

$4.$ In the present schematic diagram the barren solution from electrowinning is neutralized

using Ca$($OH$)2.$ After neutralization water, must pass through the ion exchange section for

remaining dissolved impurity removal. What could be the suspicious impurities to target,

and which type of ion exchangers must be used to remove them?

$5.$ Explain the process mechanism of ion exchang