The solution of copper sulphate in which copper rod is dipped is diluted to 10 times. The reduction potential of copper

Answer

a

Explanation

a.
`Cu^(2+) (aq) + 2e^(-) rarr Cu(s)`
Using Nernest equation initially.
`E_((Cu^(2+)//Cu) i nitial)=E^(c-)._((Cu^(2+)|Cu))-(0.059)/(2)log.(1)/([Cu^(2+)]_(i n i t ial))`
Using Nernst equation after dilution.
`E_((Cu^(2+)|Cu)fi nal)=E^(c-)._((Cu^(2+)|Cu))-(0.059)/(2) log .(1)/([cU^(2+)]_(fi nal))`
`(E_(Cu^(2+)|Cu))_(fi n al)-(E_(Cu^(2+)|Cu))_(i nitial)`
`=(0.059)/(2)log.([Cu^(2+)]_(f i nal))/([Cu^(2+)]_(i nitial))`
`=(0.059)/(2) log ((1)/(10))`
`=(0.059)/(2)xx(-1)=0.03V`.
Reduction potential of the electrode decreases by `0.03V` .