Zinc granules are added in excess to a 500 mL of 1.0M nickel nitrate solution at 25ºC until the equilibrium is reached. If the standard reduction potential of Zn 2+ /Zn and Ni 2+ /Ni are –0.75 V and –0.24 V respectively. Find out the concentration of Ni 2+ in solution at equilibrium.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
Sol. The redox change is :
Zn + Ni 2+ 
Zn 2+ + Ni
500 0 initially
a (500 – a) at equilibrium
E cell = 
E cell = 
At equilibrium, E cell = 0
∴ 
= 
or 0.75 + (–0.24) = 
or 
= antilog 
= 5.15 × 10 –18 ∴ 
= 5.15 × 10–18
∴ a = 500 × 5.15 × 10–18
∴ [Ni
2+ ] = 
= 
= 5.15 × 10– 18 M
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