Problem 4.1 A wastewater stream contains 0.02 M of Cd2+ ion, 0.02 M of Zn+ ion and 1 M of HCI. It is also saturated with dissolved HS at ambient temperature. Solubility constants are as follows: For HS: K= 1.1 X 10-23 For CdS: K= 1.0 X 10-28 For ZnS: K= 1.2 X 10-23 Determine with calculations: a. b. Whether CdS will precipitate? Whether ZnS will precipitate? The concentration of S2-ion in solution. C.