Cu2+ + 2
e−
⇌ Cu Eo = +0.34 V
Zn2+ + 2
e−
⇌ Zn Eo = −0.76 V
Thus the overall reaction is:
Cu2+ + Zn ⇌ Cu + Zn2+
The standard potential for the reaction is then +0.34 V − (−0.76 V) = 1.10 V.
Analogous to this cell reaction our E0 (cell)= -2.21-(-0.42)=-1.79 V
Which shows reaction is non spontaneous
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