The
selective estimation of these ions can be done due to difference in
the stability constants of calcium and magnesium complexes •
Some important extraction processes of metals, like those of silver and
gold, make use of complex formation Gold, for example, combines with
cyanide in the presence of oxygen and water to form the coordination
entity [Au(CN)2]
– in aqueous solution Gold can be separated in metallic
form from this solution by the addition of zinc