1. Properties of the coordination compounds
Experiment 13
Properties of the coordination compounds

2. Purposes 1. To observe the formation of coordination
compounds and the distinguish between complex
ions and simple ions.
2. To compare the stabilities of complex ions.
3. To know the relationship between the coordination
equilibrium and the precipitation reaction,
oxidation-reduction reaction and the acidities of
solutions.

3. Principles complex ions complex compounds / coordination compounds
chelates
formation constant (Kf) / stability constant (Ks)

4. Procedure 1. The generation of coordination compounds Cu(OH)2
NH3 ·H2O
Cu(OH)2
1ml CuSO4
NH3 ·H2O
[Cu(NH3)4]2+

5. 2. The distinguish between the complex ions and the simple ions①
KSCN
[Fe(SCN)6)3-]
0.1M
FeCl3
KSCN
0.1M K3[Fe(CN)6) ?
NaOH ②
NH3 ·H2O
NH3 ·H2O
NiSO4
Ni(OH)2
[Ni(NH3)4)]2+
NaOH
Ni(OH)2
NiSO4

6. 3. Compare the stabilities of complex ions
NH3 ·H2O
[Ag(NH3)2)]+ KI
AgNO3
Na2S2O3
[Ag(S2O3)2)] 3-

7. 4．The shifting of coordination equilibrium①
Ag+ + Cl- = AgCl ↓ +
2 NH3 ·H2O
Cl- ?
[Ag(NH3)2)]+ I- ?

8. ② Fe3+ + 6F- ③ CCl4 [FeF6]3- I- CCl4 1d H2SO4 + 1d H2SO4 [Cu(NH3)4]2+↓

9. 5．Shielding effect of ligands
EDTA
Pb(NO3)2 ?
K2CrO4 ?
Pb(NO3)2
H2O