Eriochrome blue black R CAS:2538-85-4

Eriochrome Blue Black R is a chemical compound commonly used as an indicator in complexometric titrations. It is a blue to black solid and changes color depending on the pH of the solution. In its acidic form, it appears blue, while in its alkaline form, it turns to purple or pink. This color change makes it useful for determining the endpoint of titrations involving metal ions, particularly the determination of water hardness. Eriochrome Blue Black R is also employed in the analysis of soil and water samples for metal content.

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