Question

1. A solution is prepared so that the concentrations of manganese(II) nitrate, zinc(II) nitrate, mercury(II) nitrate, and copper(II) nitrate are all 0.100 M. If the solution is slowly titrated with 0.100 M sodium sulfide, which metal sulfide will precipitate first?

zinc sulfide, K_sp = 1.8???10^?25

copper(II) sulfide, K_sp = 5.4???10^?37

manganese(II) sulfide, K_sp = 2.4???10^?14

mercury(II) sulfide, K_sp = 1.8???10^?53

^2. Calculate molar solubilities, concentrations of constituent ions, and solubilities in grams per liter for the following compounds at 25°C:

[Sn²⁺] =

[S^2?] =

solubility = g SnS/Liter

[Cd²⁺] =

[PO₄^3?] =

solubility = g Cd₃(PO₄)₂/Liter

tin(II) sulfide, SnS, K_sp = 9.00???10^?27

cadmium(II) phosphate, Cd₃(PO₄)₂, K_sp = 2.50???10^?33