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Is it possible to store : (i) copper suplhate solution in a zonc vessel ? (ii) Copper suphate solution in silver vessel ? (iii) Copper suphate solutionin a gold vessel ? Given : E_(Cu^(2+),Cu)^(@)=+0.34V,E_(Ag^(+),Ag)^(@)=+0.80V "and" E_(Au^(3+),Au)^(@)=+1.50V |
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Answer» Solution :(i) We cannot `SuSO_(4)` soluton in a zinc vessel if the following REDOX reaction occurs `Zn+CuSO_(4)rarrZnSO_(4)+Cu` or `Zn+Cu^(2+)rarrZn^(2+)+Cu` By convention the cell may be represented as `Zn|Zn^(2+)||Cu^(2+)|Cu` By convention the cell of the above redox reaction may be represented as `Ag|Ag^(+)||Cu^(2+)|Cu` and `E_(cell)^(@)=E_(Cu^(2+),Cu)^(@)-E_(Ag^(+),Ag)^(@)=0.34-0.80 =-0.56 V` since the EMF of the cell is -ve therefore `CuSO_(4)` does not react with SILVER in other wods `CuSO_(4)` solution can be stroed in asilver vessel (iii) we cannot stroe `CuSO_(4)` solution in a GOLD vessel if the following redox reaction occurs `2 Au+3Cu^(2+) rarr2 Au^(3+)+3Cu` The cell corresponding to the above redox reaction may be represented as `Au|Au^(3+)||Cu^(2)|Cu` and `E_(Cu^(2+),Cu)^(@)-E_(Au^(3+),Au)^(@)=0.34 -1.50 =-1.26 V` since the EMF of the above cell reaction is -ve therefore `CuSO_(4)` solution does notreact with gold in other words `CuSO_(4)` SOLUTOIN can be stored ina gold vessel |
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