Question

A cell is prepared by dipping a copper rod is 1 M CuSO4 solution and a nickel rod in 1 M NiSO4 solution. The standard electrode potentials of copper electrode and nickel electrode are 0.34 V and -0.25V respectively. Write the cell reaction & calculate the emf of cell.

Answer 1

Answer:

• When Zn metal is dissolved in CuSO4 solution, then the following redox reaction takes place:

Zn(0)+CuSO4(II)→ZnSO4(II)+Cu(0)

• This is because Zn has a higher tendemcy to get oxidised, owing to its higher oxidation potential.
• The first observation is the change of colour of the solution from blue( due to CuSO4 solution) to colourless (due to ZnSO4 solution).
• Also, the reduced copper metal may deposit on the base of the vessel.