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

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

Text 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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Knowledge Check

  • Assertion : Cu^+ ion is not stable in aqueous solution. Reason : Cu^+ contains 3d-filled subshell.

    A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
    B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
    C
    Assertion is correct statement but reason is wrong statement.
    D
    Assertion is wrong statement but reason is correct statement

  • 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]

    A
    `-0.38 V`
    B
    `+ 0.19 V`
    C
    `-0.49 V`
    D
    `+ 0.38 V`

  • Cu^(+) ion is not stable in aqueous solution because of disproportionation reaction. E^(@) value for disproportionation of Cu^(+) is (Given E_(Cu^(2+)//Cu^(+))^(@)=0.15,E_(Cr^(2+)//Cu)^(@)=0.34V )

    A
    `-0.49V`
    B
    `0.19V`
    C
    `-0.38V`
    D
    `0.38V`

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    Using the electrochemical series table, explain why Cu (I) sulphate does not exist in aqueous solution

    Which one of the following ions is the most stable in aqueous solutions ? (At. No. Ti=22, V=23, Cr= 24 , Mn = 25)

    Which of the following ions is the most stable in aqueous solution ? (At . No . Ti = 22, V = 23, Cr = 24, Mn = 25)

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