Description
Eriochrome black T powder, also known as Solochrome Black, is a synthetic dye compound commonly used as an indicator in analytical chemistry, particularly in complexometric titrations. It is a dark-colored powder with the chemical name 1-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-ylazo)-2-naphthol. Eriochrome black T undergoes a color change in the presence of metal ions, notably calcium, magnesium, and zinc, transitioning from red to blue or purple. This color change serves as an endpoint indicator in titration reactions, facilitating the determination of metal ion concentrations in solution.