Question

Consider the insoluble compound silver iodide , AgI . The silver ion also forms a complex...

Consider the insoluble compound silver iodide , AgI . The silver ion also forms a complex with cyanide ions . Write a balanced net ionic equation to show why the solubility of AgI (s) increases in the presence of cyanide ions and calculate the equilibrium constant for this reaction. For Ag(CN)2- , Kf = 5.6×1018 . Find K

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Answer #1

       AgI(s) --------->Ag+ + I-        Ksp

      Ag+ + 2CN-   -------> [Ag(CN)]-        Kf  

--------------------------------------------------------

over all AgI(s) + 2CN- -----------> [Ag(CN)]-   KC

KsP = 8.3*10-17

K   = Ksp * Kf

     = 8.3*10-17 *5.6*1018     = 4.468*102

large kc value very soluble in NaCN

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