Final answer:
The end point of an EDTA titration is typically detected using a metal ion indicator, which changes color upon forming a complex with metal ions and indicates that the equivalence point has been reached.
Step-by-step explanation:
To detect the end point of an EDTA titration, one can use a metal ion indicator. This is a substance whose color changes when it forms a complex with the metal ions in the solution. As the EDTA is added to the solution, it binds with free metal ions, which causes a color change when all the metal ions have reacted. This color change signals that the equivalence point of the titration has been reached.
Other methods, like potentiometric titration using an ion-selective electrode or a redox indicator, may be used for different types of titrations, such as redox titrations. In redox titrations, indicators are used that have a different color in their oxidized and reduced forms, which signals the end point based upon a color change in the solution. However, for complexometric titrations involving EDTA, using a metal ion indicator is appropriate and effective.