Define metal ion indicator with suitable example?

Question: Define metal ion indicator with suitable example?

A metal ion indicator is a type of organic compound that changes its color when it binds to a metal ion in a solution. It is often used in complexometric titrations to detect the endpoint of a reaction between a metal ion and a ligand, such as EDTA. A metal ion indicator should have a distinct color change at a specific pH range and form a stable complex with the metal ion. One example of a metal ion indicator is erichrome black T, which forms a red complex with Mg2+ and a blue complex with EDTA at pH 10.

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