Question

Many copper (I) compounds are unstable in aqueous solution and undergo disproportionation. Explain.​

Answer 1

Explanation:

Many copper (I) compounds are unstable in aqueous solution and undergo disproportionation as 2Cu+ → Cu + Cu2+ . This is due to. free energy change of reaction is positive. ... second ionisation energy of Cu is higher than first ionisation energy.

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Answer 2

Explanation:

Cu+ is unstable in aqueous solution than Cu2+ because although 2nd I.E. of copper is large but hydration enthalpy for Cu2+ is much more negative than that for Cu+ and hence, it is more than compensates for the 2nd I.E. of copper. Therefore, many Cu+ compounds are unstable in aqueous solution and undergo disproportionation.

2Cu+ → Cu2+ + Cu