Consider the insoluble compound nickel(II) hydroxide , Ni(OH)2 . The nickel ion also forms a complex with cyanide ions . Write a balanced net ionic equation to show why the solubility of Ni(OH)2 (s) increases in the presence of cyanide ions and calculate the equilibrium constant for this reaction. For Ni(CN)42- , Kf = 1.0×1031 . Use the pull-down boxes to specify states such as (aq) or (s).

Respuesta :

Answer: Equilibrium constant for this reaction is [tex]2.8 \times 10^{15}[/tex].

Explanation:

Chemical reaction equation for the formation of nickel cyanide complex is as follows.

[tex]Ni(OH)_{2}(s) + 4CN^{-}(aq) \rightleftharpoons [Ni(CN)_{4}^{2-}](aq) + 2OH^{-}(aq)[/tex]

We know that,

      K = [tex]K_{f} \times K_{sp}[/tex]

We are given that, [tex]K_{f} = 1.0 \times 10^{31}[/tex]

and,    [tex]K_{sp} = 2.8 \times 10^{-16}[/tex]

Hence, we will calculate the value of K as follows.

     K = [tex]K_{f} \times K_{sp}[/tex]

     K = [tex](1.0 \times 10^{31}) \times (2.8 \times 10^{-16})[/tex]

        = [tex]2.8 \times 10^{15}[/tex]

Thus, we can conclude that equilibrium constant for this reaction is [tex]2.8 \times 10^{15}[/tex].