3. For the cell, Cu Cu? (0.13 M) || Ag* (0.01 M) 1 Ag,
(a) Calculate the reduction potential of each electrode if
the standard reduction potential for copper and silver
electrodes are 0.34 V and 0.80 V respectively.
(b) Calculate the emf of the cell.
(c) Write the cell reaction.
(d) Is this cell reaction spontaneous? Why?
(2001)
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Explanation:
Answer
Standard reduction potential of Ag
+
/Ag=0.80V.
Standard reduction potential of Cu
2+
/Cu is less than Ag
+
/Ag.
∴Ag
+
/Ag will get reduced at cathode.
Cu
2+
/Cu will get oxidized at anode.
∴E
cell
∘
=E
cathode
∘
−E
anode
∘
E
cell
∘
=0.80−0.34=0.46V.
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