Summary: Ammine complexes of 2+ ions of copper, nickel and cobalt are made by the addition of ammonium hydroxide. The distinct color of the different metal ammines are observed.
Hazards:
Conc. ammonium hydroxide is toxic and corrosive. Avoid exposure.
Nickel salts are considered possible carcinogens. Use care.
Chemicals and Solutions:
Conc. Ammonium hydroxide
0.1M Copper sulfate
0.1M Nickel nitrate
0.1M Cobalt chloride
Materials:
3 hydrometer cylinders
3 stir rods
Procedure:
Add approximately 2 parts of ammonium hydroxide to each of the metal ion solutions to generate the ammine.
Hint:
Discussion:
Balanced Chemical Equation |
Color |
Cu2+(aq) + 4NH3(aq) ---> Cu(NH3)42+(aq) |
super blue |
Ni2+(aq) + 6NH3(aq) ---> Ni(NH3)62+(aq) |
violet |
Co2+(aq) + 6NH3(aq) ---> Co(NH3) 62+(aq) |
red/orange |
To schedule a demonstration, please send an email to the demonstration lab.
Contact:
Eric Camp
Lecture Demonstration Technician
Bagley Hall 171
(206) 543-1606