How is chelation related to equilibriums?

[tahayassen]

The attempt at a solution

The chemical equation of a chelating agent with a metal ion is an equilibrium reaction.

I'm totally lost. :(

 

[epenguin]

You give no context but I suppose it is meant that the formation of the chelate is a very very fast reaction that you will not be able to watch happening by any ordinary means and ordinary timescale, you will always see it at equilibrium. Like protonation-deprotonation.
I am sure there will be an oddball exception known.

 

[Borek]

Compare http://www.titrations.info/EDTA-titration-aluminum