![]() ![]() The fungus Aspergillus niger plays a role in the solubilization of heavy metal sulfides. Several have practical applications as pigments, in solar cells, and as catalysts. ![]() In fact, the bonding in transition metal sulfides is highly covalent, which gives rise to their semiconductor properties, which in turn is related to the deep colors. Such species are sometimes referred to as salts. The black tarnish formed on sterling silver is Ag 2S. One famous example is the bright yellow species CdS or " cadmium yellow". Such inorganic sulfides typically have very low solubility in water, and many are related to minerals with the same composition (see below). Metal sulfides react with halogens, forming sulfur and metal salts.Ĩ MgS + 8 I 2 → S 8 + 8 MgI 2 Metal derivatives Īqueous solutions of transition metals cations react with sulfide sources (H 2S, NaHS, Na 2S) to precipitate solid sulfides. Depending on the conditions, the oxidation can produce elemental sulfur, polysulfides, polythionates, sulfite, or sulfate. Oxidation of sulfide is a complicated process. Upon treatment with an acid, sulfide salts convert to hydrogen sulfide: Instead sulfide converts to hydrosulfide: The sulfide ion, S 2−, does not exist in aqueous alkaline solutions of Na 2S. Hydrogen sulfide (H 2S) and bisulfide (SH −) are the conjugate acids of sulfide. Sulfide also refers to chemical compounds large families of inorganic and organic compounds, e.g. Solutions of sulfide salts are corrosive. Sulfide ( British English also sulphide) is an inorganic anion of sulfur with the chemical formula S 2− or a compound containing one or more S 2− ions. ![]()
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