1.

Consider the cell Zn|Zn^(2+) (aq) (1.0M) ||Cu^(2+) (aq) (1.0M) |Cu The standard reduction potentials are +0.35 V for 2e+ Cu^(2+) (aq) to Cu and -0.763V for 2e+Zn^(2+) (aq) to Zn Is the cell reaction spontaneous or not?

Answer»

Solution :Further `E_(cell)=E_(Ag^+,Ag)^@-E_(Cd^(2+),Cd)`
`={E_(Ag^+,Ag)^@+0.0591/1 LOG [Ag^+]}- {E_(Cd^(2+),Cd)^@+0.0591/2log[Cd^(2+)]}`
`={E_(Ag^+,Ag)^@-E_(Cd^(2+),Cd)^@}+0.0591/1 log""([Ag^+])/([Cd^(2+)]^(1/2))`
`=E_(cell)^@+0.0591 log""([Ag^+])/([Cd^(2+)]^(1/2))`
SINCE `[Cd^(2+)]` is in the denominator, DECREASE in `[Cd^(2+)]` will make `E_(cell)` more POSITIVE.


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