The standard reduction potential of 
and 
electrodes are 0.337 and 0.799 volts respectively. Construct a galvanic cell using these electrodes so that its standard emf is positive. For what concentration of Ag+ will the emf of the cell, at 25ºC, be zero if the concentration of Cu 2+ is 0.01 M.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
Given, 
= 0.337 V
= –0.337 V
= 0.799 V
∴ 
= –0.799 V
Cu should be oxidized and Ag+ is reduced because
∴ Cu + 2Ag + ⎯→ Cu 2+ + 2 Ag
Thus the cell is :
Cu(s)/CuSO 4 (aq) || AgNO 3 (aq)/Ag(s)
∴ E cell = 
E cell = 
– 
log[Cu 2+ ]
+ 
+ 
log[Ag + ] 2 E cell = 
+ 
+ 
E cell = –0.337 + 0.799 + 
E cell = 0, at [Cu
2+ ] = 0.01 M
∴ 0 = 0.462 + 
∴ [Ag + ] = 1.477 × 10 –9 mol/L
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