Of the acid insoluble sulfide cations, which do not form sulfide complexes, and which do form anionic sulfide complexes?
a. Just what is an anionic sulfide complex? Explain in terms of coordination chemistry, and show reactions of their formation. When do these complexes form? Are these complexes water soluble?
b. how are the cations that do complex with sulfide separated from those that do not form complexes?
c. How can sulfide precipitates be formed from cation-sulfide complexes?