Multiple choice

Which of the following dyes is used as a complexometric indicator ?

  1. Calcein

  2. Carboxyfluorescein

  3. Eosin

  4. Erythrosine

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A Correct answer
Explanation

Calcein is a fluorescent dye with excitation and emission wavelengths of 495/515 nm, respectively. It is used as a complexometric indicator for titration of calcium ions with EDTA, and for fluorometric determination of calcium. It has the appearance of orange crystals.