Ammines

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

ericcamp@uw.edu

 

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