how does eriochrome-T function as an indicator in EDTA titration?why is it used?

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how does eriochrome-T function as an indicator in EDTA titration?why is it used?

2007-03-25 04:45:21 · 1 answers · asked by SWETA 2 in Science & Mathematics ➔ Chemistry

1 answers

It's actually Eriochrome Black T and is an azo dye.

When not complexed to metal ions, it is blue. When it is, it is red. Since metals preferentially bind to EDTA vs. Eriochrome Black T, when enough EDTA has been added to grab all of the metal ions, the color of free Eriochrome Black T is seen.

2007-03-25 04:54:47 · answer #1 · answered by TheOnlyBeldin 7 · 0⤊ 0⤋