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The indicator added to the sample is Eriochrome
Black T. Initially, the indicator will form a complex with the cations. When complexed
it is red in color. As the EDTA is added dropwise to the sample, it replaces the Erio T
and forms more stable complexes with calcium and magnesium. When the indicator is
released by the metal ions, it has a distinct blue color. Therefore, the endpoint of the
titration is marked by the color change form red to blue
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