Consider the insoluble compound zine cyanide. Za(CN2. The zine ion also forms a complex with ammonÃa. Write a balanced net ionic equation to show why the solubility of Zn(CN)2 (s) increases in the presence of ammonia and calculate the equilibrium constant for this reaction. For Zn(NH3)42+ , Kf 2.9% 109 . Use the pull-down boxes to specify states such as (aq) or (s). Submit Answer Retry Entire Group 5 more group attempts remalning Solution Zn(CN)2 (s) ------------------> Zn2+ (aq) + 2 CN- (aq) , Ksp = 8 x 10^-12 Zn2+(aq)+ 4 NH3 (aq) --------------------> Zn(NH3)42+    , Kf = 2.9 x 10^9 ----------------------------------------------------------------------------------------------------- overall reaction balnaced net ionic equation : Zn(CN) 2 (s)   + 4 NH 3 (aq) <--------------------> Zn(NH 3 ) 4 2+ + 2 CN - (aq)     ( -------------> answer 1 ) K = Ksp x Kf K = 8 x 10^-12   x 2.9 x 10^9 K = 2.32 x 10 -2 ( -------------> answer 2 ) .

1. Consider the insoluble compound zine cyanide. Za(CN2. The zine ion also forms a complex with
ammonÃa. Write a balanced net ionic equation to show why the solubility of Zn(CN)2 (s)
increases in the presence of ammonia and calculate the equilibrium constant for this reaction. For
Zn(NH3)42+ , Kf 2.9% 109 . Use the pull-down boxes to specify states such as (aq) or (s).
Submit Answer Retry Entire Group 5 more group attempts remalning
Solution
Zn(CN)2 (s) ------------------> Zn2+ (aq) + 2 CN- (aq) , Ksp = 8 x 10^-12
Zn2+(aq)+ 4 NH3 (aq) --------------------> Zn(NH3)42+Â Â Â , Kf = 2.9 x 10^9
-----------------------------------------------------------------------------------------------------
overall reaction balnaced net ionic equation :
Zn(CN) 2 (s)Â Â + 4 NH 3 (aq) <--------------------> Zn(NH 3 ) 4
2+ + 2 CN - (aq)Â Â Â Â ( -----
--------> answer 1 )
K = Ksp x Kf
K = 8 x 10^-12Â Â x 2.9 x 10^9
K = 2.32 x 10 -2 ( -------------> answer 2 )