Transition Metals
Purpose:
To observe physical and chemical properties of transition metal ions in aqueous
solutions.
To observe the results of mixing three different chemicals (NH3, KSCN, and NaOH) with
metal ions.
To compare chemical reactions of transition metal ions with those of other metal ions.
Equipment:
Plastic Wrap and Template
Chemicals:
KNO3, K+
Cr(NO3)3, Cr3+
Co(NO3)2, Co2+
Ni(NO3)2, Ni2+
Zn(NO3)2, Zn2+
NH3
NaOH
Stirring Rod
Ca(NO3)2, Ca2+
Mn(NO3)2, Mn2+
Fe(NO3)3, Fe3+
Cu(NO3)2, Cu2+
NH4VO3, V5+
KSCN
Experimental Procedure:
1. Review the list of metals that you will be testing. Form a hypothesis about which two
metals are likely to have properties different from the others.
2. Set up the reaction surface on the template.
3. CAUTION: Many of the chemicals you will use are toxic. Follow proper chemical
hygiene procedures. Wash your hands thoroughly after completing the experiment.
Use one drop of each chemical for each reaction according to your report sheet. Stir the
solution with a clean stirring rod. Wipe the stirring rod with a wet paper towel between
reactions. Be careful to use only one drop of each chemical; different amounts can lead
to differences in results.
4. Place one drop of each metallic compound in the control row. You will use this to
compare colors as you proceed with the experiment. Record these colors.
5. Record the results of each chemical mixing.
NVR – no visible reaction
Ppt – precipitate forms (cloudy or solid pieces present)
Color change
Cpx – complex forms (soluble, colored compound)
6. Keep the reaction surface and results handy as you answer the laboratory questions.
When finished place a paper towel on the surface and discard in the trash.
7. Wash your hands with soap and water.