1.

The standard reduction potential E^(@)(Bi^(3+)//Bi) and E^(@)(Cu^(2+)//Cu) are 0.226V and 0.344V respectively. A mixture of salts of bismuth and copper at unit concentration each is electrolysed at 25^(@)C. To what value can [Cu^(2+)] be brought down before bismuth starts to deposit in electrolysis.

Answer»


SOLUTION :`E_(Cu^(2+)//Cu) = E_(Cu^(2+)//Cu)^(@) +(0.059)/(2) LG c[Cu^(2+)]`
`[Cu^(2+)] = 10^(-4)m`


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