SULFIDES
ammonium sulfide
barium sulfide
copper (I) sulfide
copper (II) sulfide
iron (II) sulfide
lead (II) sulfide
potassium sulfide
sodium sulfide
zinc sulfide
|
-
|
-
|
-
|
-
-
|
Many metal sulfides react violently with oxidising agents. When heated to decomposition they produce toxic fumes of sulfur compounds. They react with acid or water to produce toxic hydrogen sulfide gas. Alkaline sulfides, calcium, sodium, ammonium and potassium behave like alkalis, causing softening and irritation of the skin. Sulfides of heavy metals are generally insoluble and have low toxicity; they do however react with acids to release hydrogen sulfide gas. Metal sulfides are commonly used to study activity series of metals and the nature of the sulfide ion, reactions with acids, reactions with water, heated to decomposition and in redox reactions-including the formation of precipitates.
Disposal: Sulfide solutions (not containing heavy metals) may be discharged down the sink (to sewer) after treatment.
1. Solutions should be made acidic in a fume cupboard to expel hydrogen sulfide gas.
2. At completion of the reaction the solution should be made basic (use sodium hydroxide) to pH: 8-10. Then discharged down the sink.
ALSO SEE SEPARATE LISTING FOR EACH CHEMICAL.
Also see Appendix E.
|
