Hazards:
Nickel salts are particularly toxic.
Copper and cobalt salts are toxic.
Chemicals and Solutions:
0.1M Cobalt chloride
0.1M Copper sulfate
0.1M Nickel nitrate
0.1M Sodium carbonate
0.1M Sodium hydroxide
Materials:
Hydrometer cylinders
Procedure:
Mix nickel nitrate solution with sodium carbonate solution to form a green ppt. of nickel carbonate.
Mix copper sulfate solution with sodium carbonate solution to form a blue ppt. of copper carbonate.
Mix cobalt chloride solution with sodium carbonate solution to form a purple ppt. of cobalt carbonate.
Use excess carbonate, to assure that precipitation of the toxic metal ion.
Hint:
Discussion:
Carbonate salts are insoluble with the exception of those containing alkali metal ions and ammonium ions.
To schedule a demonstration, please send an email to the demonstration lab.
Contact:
Eric Camp
Lecture Demonstration Technician
Bagley Hall 171
(206) 543-1606