Recent research on the solubility of Greenockite, a thermodynamically stable form of cadmium sulfide (CdS), reveals that mildly acidic solutions with sulfide concentrations between 10-4 and 10-3 M can effectively minimize the solubility of CdS. Determine the final pH of one liter of solution at equilibrium with CdCO3(s) after addition of 4×10-4 moles of H2S and 1×10-2 M of NaCl. The pertinent complexation reactions are (neglect any other complexation reactions):
CdS complexation
logKsp=14.36
logK1=-4.73
logK2=2.33
logK4=6.57
logK5=-16.83
logK6=-6.85
CdCl
K1=34.7
K2=4.57
K3=1.26
K4=0.2
Use this and information to determine the concentration of the species you expect to find in this system.