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

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

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`Cu^(+)` in aqueous solution disproportionates to `Cu^(2+) and Cu`
`2Cu_((aq))^(+) rarr Cu + Cu_((aq))^(2+)`
The `Cu^(2+)` is more stable because of its high hydration enthalpy than `Cu^(+)` which more than compensates the second ionization enthalpy of copper
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