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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^(2+)` (aq) is much more stable than `Cu^(+)` (aq). Although second ionisation enthalpy of copper is large but `Delta_("hyd")` H for `Cu^(2+)` (aq) is much more negative than that for `Cu^(+)` (aq) and hence it more than compensates for the second ionisation enthalpy of copper. Therefore, many copper (I) compounds are unstable in aqueous solution and undergo disproportionation.
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