Challenge Problem: Zinc sulfide, ZnS, is sparingly soluble in most situations. With ammonia, Zn2+ forms four complexes, Zn(NH3)2+, Zn(NH3)22+, Zn(NH3)32+, and Zn(NH3)42+. Ammonia is, of course, a base, and S2- is the anion of the weak diprotic acid, H2S. Find the molar solubility of zinc sulfide in
(a)pH-7.0 water.
(b)a solution containing 0.100 M NH3.
(c)a pH-9.00 ammonia/ammonium ion buffer with a total NH3/NH4+ concentration of 0.100 M.
(d)the same solution as in part (c) except that it also contains 0.100 M EDTA.
(e)Use a search engine and locate a Materials Safety Data Sheet (MSDS) for ZnS. Determine what health hazards ZnS poses.
(f)Determine if there is a phosphorescent pigment containing ZnS. What activates the pigment to "glow in the dark"?
(g)Determine what uses ZnS has in making optical components. Why is ZnS useful for these
components?
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