The presence of a common ion. The pH of the solution. The presence of complexing agents. K sp , equilibrium exists. Coordination compounds Complexes complex ion .
Ligands can alter properties of the metal.
The charge on a complex ion equals the sum of the charge on the metal and the charges on the ligands. The most common coordination numbers are 4 and 6. The amount of charge transferred from ligand to metal affects the coordination number. Six-coordinate complexes are usually octahedral. EDTA occupies six coordination sites.