Essay
A solution was prepared such that the initial concentrations of Cu2+(aq)and CN-(aq)were 0.0120 M and 0.0400 M, respectively. These ions react according to the following chemical equation
Cu2+(aq)+ 4CN-(aq) 
Cd(CN)42-(aq)Kc = 1.0 * 1025
What will be the concentration of CN-(aq)at equilibrium?
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