InterviewSolution
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InterviewSolution
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Can a solution of 1 M copper sulphate be stored in a vessel made of nickel metal? Given that `E_(Ni,Ni^(2+))^(@)=+0.25" volt ",E_(Cu,Cu^(2+))^(@)=-0.34` volt. Can nickel spatula be used to stir a solution of copper sulphate? Support your answer with a reason. `E_(Ni^(2+)//Ni)^(@)=-0.25V,E_(Cu^(2+)//Cu)^(@)=+0.34V`. |
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Answer» In this problem, we want to see whether the following reaction takes place or not: `Ni+CuSO_(4)toNiSO_(4)+Cu," i.e., "Ni+Cu^(2+) to Ni^(2+) +Cu` By convention, the cell may be represented as: `Ni|Ni^(2+)||Cu^(2+)|Cu` `E_(Ni,Ni^(2+))^(@)=+0.25" volt" and E_(Cu,Cu^(2+))^(@)=-0.34" volt"` Hence, the reduction potential will be `E_(Ni^(2+),Ni)^(@)=-E_(Ni,Ni^(2+))^(@)=-0.25" volt " and E_(Cu^(2+),Cu)^(@)=-E_(Cu,Cu^(2+))^(@)=+0.34" volt"` `E_(cell)^(@)=E_(RHS" electrode")^(@)-E_("L.H.S. electrode")^(@)=+0.34-(-0.25)=+0.59` volt Thus, EMF comes out to be positive. this implies that `CuSO_(4)` reacts with nickel. hence, `CuSO_(4)` cannot be sotred in nickel vessel. |
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