Question

The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is 1.0 × 10^–19 M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following: FeSO₄, MnCl₂, ZnCl₂ and CdCl₂. in which of these solutions precipitation will take place? 

Answer 1

_{For precipitation to take place, it is required that the calculated ionic product exceeds the} 

_{Ksp value.} 

_{Before mixing:} 

_{After mixing:} 

_{This ionic product exceeds the Ksp of Zns and CdS. Therefore, precipitation will occur in CdCl2 and ZnCl2 solutions}