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Explain why Cu^(+) ion is not stable in ...

Explain why `Cu^(+)` ion is not stable in aqueous solutions ?

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In aqueous solution `Cu^(+)(aq)` undergoes disproportionation to form `Cu^(2+)(aq)` ion and Cu.
`2Cu^(+)(aq) to Cu^(2+)(aq)+Cu(s)`
The higher stability of `Cu^(2+)(aq)` in aqueous solution may be attributed to its greater negative `Delta_("hyd")H^(ɵ)` than that of `Cu^(+)(aq)`. It compensates the second ionisation enthalpy of Cu involved in the formation of `Cu^(2+)` ion. Thus, `Cu^(+)(aq)` ion changes to `Cu^(2+)(aq)` ion which is more stable.
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Cu^(+) ion is not stable in aqueous solution because because of dispropotionation reaction. E^(@) value of disproportionation of Cu^(+) is [E_(Cu^(2+)//Cu^(+))^(@)=+ 0.15 V, E_(Cu^(2+)//Cu)^(@)=0.34 V]